Applications Core+Index: hash_hkdf(): Argument #2 ($key) cannot be empty

The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 33.0.0
  • Operating system and version (e.g., Ubuntu 24.04):
    • Debian 13 on VM hosted by Strato
  • Web server and version (e.g, Apache 2.4.25):
    • Apache/2.4.66 (Debian)
  • Reverse proxy and version _(e.g. nginx 1.27.2)
    • n.a.
  • PHP version (e.g, 8.3):
    • 8.3
  • Is this the first time you’ve seen this error? (Yes / No):
    • Yes
  • When did this problem seem to first start?
    • After server migration
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • TAR download, manual install
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • No

Summary of the issue you are facing:

The Logging page in the Nextcloud Administartion section shows the following two erors frequently:

  • Loglevel: Error
    Application: Index
    Message:
    xceptionhash_hkdf(): Argument #2 ($key) cannot be empty in file ‘/var/www/mauscloud/lib/private/Security/Crypto.php’ line 147

    → New entry each time I open the Administration Settings

  • Loglevel: Error
    Application: Core
    Message: ValueErrorhash_hkdf(): Argument #2 ($key) cannot be empty Error while running background job OCA\DAV\BackgroundJob\EventReminderJob (id: 809, arguments: null)

    → New entry each time the background jobs run

Steps to replicate it (hint: details matter!):

  1. Old VM installation (Debian 10) with Nextcloud 32.0.6 was EOL, backed up Nextclod file storage and database but unfortunately not /var/www/nextcloud.

  2. Installed Debian 13 and Nextcloud 32.0.6 with PHP 8.2 as on the old Debian 10 installation.

  3. Restored storage and database . Nextcloud did not come up due to missing apps.

  4. Installed all required apps on a 2nd host with a vanilla Nextcloud and copied the necessary app folders over to my ‘production’ Nextcloud instance.

  5. After this, Nextcloud started up and seemed to run fine.

  6. Clients did not reconnect automatically, I had to enter the login for each client again but then file-sync worked.

  7. Updated PHP to version 8.3. and Nextcloud to 33.0.0

  8. Checked the system in more detail and realized the errors in the log. Unfortunately I am not even sure, if they already existed in the old Debian 10 installation, which I updated from a quite old version only recently.

Log entries

Nextcloud

I copied only one message for each app (core and index) from nextcloud.log. They show up frequently and seem to have all the same content.

{"reqId":"wI92FQ6MmiINBQLIjTkz","level":3,"time":"March 21, 2026 16:50:02","remoteAddr":"","user":"--","app":"core","method":"","url":"--","scriptName":"/var/www/mauscloud/cron.php","message":"Error while running background job OCA\\DAV\\BackgroundJob\\EventReminderJob (id: 809, arguments: null)","userAgent":"--","version":"33.0.0.16","occ_command":["/var/www/mauscloud/cron.php"],"exception":{"Exception":"ValueError","Message":"hash_hkdf(): Argument #2 ($key) cannot be empty","Code":0,"Trace":[{"file":"/var/www/mauscloud/lib/private/Security/Crypto.php","line":147,"function":"hash_hkdf"},{"file":"/var/www/mauscloud/lib/private/Security/Crypto.php","line":102,"function":"decryptWithoutSecret","class":"OC\\Security\\Crypto","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php","line":121,"function":"decrypt","class":"OC\\Security\\Crypto","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php","line":135,"function":"retrieveKey","class":"OC\\Security\\IdentityProof\\Manager","type":"->"},{"file":"/var/www/mauscloud/apps/notifications/lib/Push.php","line":261,"function":"getKey","class":"OC\\Security\\IdentityProof\\Manager","type":"->"},{"file":"/var/www/mauscloud/apps/notifications/lib/App.php","line":37,"function":"pushToDevice","class":"OCA\\Notifications\\Push","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/mauscloud/lib/private/Notification/Manager.php","line":313,"function":"notify","class":"OCA\\Notifications\\App","type":"->"},{"file":"/var/www/mauscloud/apps/dav/lib/CalDAV/Reminder/NotificationProvider/PushProvider.php","line":83,"function":"notify","class":"OC\\Notification\\Manager","type":"->"},{"file":"/var/www/mauscloud/apps/dav/lib/CalDAV/Reminder/ReminderService.php","line":147,"function":"send","class":"OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\PushProvider","type":"->"},{"file":"/var/www/mauscloud/apps/dav/lib/BackgroundJob/EventReminderJob.php","line":47,"function":"processReminders","class":"OCA\\DAV\\CalDAV\\Reminder\\ReminderService","type":"->"},{"file":"/var/www/mauscloud/lib/public/BackgroundJob/Job.php","line":47,"function":"run","class":"OCA\\DAV\\BackgroundJob\\EventReminderJob","type":"->"},{"file":"/var/www/mauscloud/lib/public/BackgroundJob/TimedJob.php","line":85,"function":"start","class":"OCP\\BackgroundJob\\Job","type":"->"},{"file":"/var/www/mauscloud/core/Service/CronService.php","line":176,"function":"start","class":"OCP\\BackgroundJob\\TimedJob","type":"->"},{"file":"/var/www/mauscloud/core/Service/CronService.php","line":98,"function":"runCli","class":"OC\\Core\\Service\\CronService","type":"->"},{"file":"/var/www/mauscloud/cron.php","line":52,"function":"run","class":"OC\\Core\\Service\\CronService","type":"->"}],"File":"/var/www/mauscloud/lib/private/Security/Crypto.php","Line":147,"message":"Error while running background job OCA\\DAV\\BackgroundJob\\EventReminderJob (id: 809, arguments: null)","exception":"{\"class\":\"ValueError\",\"message\":\"hash_hkdf(): Argument #2 ($key) cannot be empty\",\"code\":0,\"file\":\"/var/www/mauscloud/lib/private/Security/Crypto.php:147\",\"trace\":\"#0 /var/www/mauscloud/lib/private/Security/Crypto.php(147): hash_hkdf()\\n#1 /var/www/mauscloud/lib/private/Security/Crypto.php(102): OC\\Security\\Crypto->decryptWithoutSecret()\\n#2 /var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php(121): OC\\Security\\Crypto->decrypt()\\n#3 /var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php(135): OC\\Security\\IdentityProof\\Manager->retrieveKey()\\n#4 /var/www/mauscloud/apps/notifications/lib/Push.php(261): OC\\Security\\IdentityProof\\Manager->getKey()\\n#5 /var/www/mauscloud/apps/notifications/lib/App.php(37): OCA\\Notifications\\Push->pushToDevice()\\n#6 /var/www/mauscloud/lib/private/Notification/Manager.php(313): OCA\\Notifications\\App->notify()\\n#7 /var/www/mauscloud/apps/dav/lib/CalDAV/Reminder/NotificationProvider/PushProvider.php(83): OC\\Notification\\Manager->notify()\\n#8 /var/www/mauscloud/apps/dav/lib/CalDAV/Reminder/ReminderService.php(147): OCA\\DAV\\CalDAV\\Reminder\\NotificationProvider\\PushProvider->send()\\n#9 /var/www/mauscloud/apps/dav/lib/BackgroundJob/EventReminderJob.php(47): OCA\\DAV\\CalDAV\\Reminder\\ReminderService->processReminders()\\n#10 /var/www/mauscloud/lib/public/BackgroundJob/Job.php(47): OCA\\DAV\\BackgroundJob\\EventReminderJob->run()\\n#11 /var/www/mauscloud/lib/public/BackgroundJob/TimedJob.php(85): OCP\\BackgroundJob\\Job->start()\\n#12 /var/www/mauscloud/core/Service/CronService.php(176): OCP\\BackgroundJob\\TimedJob->start()\\n#13 /var/www/mauscloud/core/Service/CronService.php(98): OC\\Core\\Service\\CronService->runCli()\\n#14 /var/www/mauscloud/cron.php(52): OC\\Core\\Service\\CronService->run()\\n#15 {main}\"}","CustomMessage":"Error while running background job OCA\\DAV\\BackgroundJob\\EventReminderJob (id: 809, arguments: null)"}}

{"reqId":"XPJPRwGIcumr7ZtfmQ0A","level":3,"time":"March 21, 2026 16:55:55","remoteAddr":"81.169.155.11","user":"--","app":"index","method":"HEAD","url":"/ocm-provider/","scriptName":"/index.php","message":"hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/mauscloud/lib/private/Security/Crypto.php' line 147","userAgent":"Nextcloud-Server-Crawler/33.0.0","version":"33.0.0.16","exception":{"Exception":"Exception","Message":"hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/mauscloud/lib/private/Security/Crypto.php' line 147","Code":0,"Trace":[{"file":"/var/www/mauscloud/lib/private/AppFramework/App.php","line":153,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/mauscloud/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/mauscloud/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/mauscloud/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/mauscloud/lib/private/AppFramework/Http/Dispatcher.php","Line":150,"Previous":{"Exception":"ValueError","Message":"hash_hkdf(): Argument #2 ($key) cannot be empty","Code":0,"Trace":[{"file":"/var/www/mauscloud/lib/private/Security/Crypto.php","line":147,"function":"hash_hkdf"},{"file":"/var/www/mauscloud/lib/private/Security/Crypto.php","line":102,"function":"decryptWithoutSecret","class":"OC\\Security\\Crypto","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php","line":109,"function":"decrypt","class":"OC\\Security\\Crypto","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php","line":174,"function":"retrieveKey","class":"OC\\Security\\IdentityProof\\Manager","type":"->"},{"file":"/var/www/mauscloud/lib/private/OCM/OCMSignatoryManager.php","line":105,"function":"getAppKey","class":"OC\\Security\\IdentityProof\\Manager","type":"->"},{"file":"/var/www/mauscloud/lib/private/OCM/OCMDiscoveryService.php","line":225,"function":"getLocalSignatory","class":"OC\\OCM\\OCMSignatoryManager","type":"->"},{"file":"/var/www/mauscloud/core/Controller/OCMController.php","line":58,"function":"getLocalOCMProvider","class":"OC\\OCM\\OCMDiscoveryService","type":"->"},{"file":"/var/www/mauscloud/lib/private/AppFramework/Http/Dispatcher.php","line":205,"function":"discovery","class":"OC\\Core\\Controller\\OCMController","type":"->"},{"file":"/var/www/mauscloud/lib/private/AppFramework/Http/Dispatcher.php","line":118,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/mauscloud/lib/private/AppFramework/App.php","line":153,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/mauscloud/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/mauscloud/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/mauscloud/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/mauscloud/lib/private/Security/Crypto.php","Line":147},"message":"hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/mauscloud/lib/private/Security/Crypto.php' line 147","exception":"{\"class\":\"Exception\",\"message\":\"hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/mauscloud/lib/private/Security/Crypto.php' line 147\",\"code\":0,\"file\":\"/var/www/mauscloud/lib/private/AppFramework/Http/Dispatcher.php:150\",\"trace\":\"#0 /var/www/mauscloud/lib/private/AppFramework/App.php(153): OC\\AppFramework\\Http\\Dispatcher->dispatch()\\n#1 /var/www/mauscloud/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#2 /var/www/mauscloud/lib/base.php(1155): OC\\Route\\Router->match()\\n#3 /var/www/mauscloud/index.php(25): OC::handleRequest()\\n#4 {main}\",\"previous\":{\"class\":\"ValueError\",\"message\":\"hash_hkdf(): Argument #2 ($key) cannot be empty\",\"code\":0,\"file\":\"/var/www/mauscloud/lib/private/Security/Crypto.php:147\",\"trace\":\"#0 /var/www/mauscloud/lib/private/Security/Crypto.php(147): hash_hkdf()\\n#1 /var/www/mauscloud/lib/private/Security/Crypto.php(102): OC\\Security\\Crypto->decryptWithoutSecret()\\n#2 /var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php(109): OC\\Security\\Crypto->decrypt()\\n#3 /var/www/mauscloud/lib/private/Security/IdentityProof/Manager.php(174): OC\\Security\\IdentityProof\\Manager->retrieveKey()\\n#4 /var/www/mauscloud/lib/private/OCM/OCMSignatoryManager.php(105): OC\\Security\\IdentityProof\\Manager->getAppKey()\\n#5 /var/www/mauscloud/lib/private/OCM/OCMDiscoveryService.php(225): OC\\OCM\\OCMSignatoryManager->getLocalSignatory()\\n#6 /var/www/mauscloud/core/Controller/OCMController.php(58): OC\\OCM\\OCMDiscoveryService->getLocalOCMProvider()\\n#7 /var/www/mauscloud/lib/private/AppFramework/Http/Dispatcher.php(205): OC\\Core\\Controller\\OCMController->discovery()\\n#8 /var/www/mauscloud/lib/private/AppFramework/Http/Dispatcher.php(118): OC\\AppFramework\\Http\\Dispatcher->executeController()\\n#9 /var/www/mauscloud/lib/private/AppFramework/App.php(153): OC\\AppFramework\\Http\\Dispatcher->dispatch()\\n#10 /var/www/mauscloud/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#11 /var/www/mauscloud/lib/base.php(1155): OC\\Route\\Router->match()\\n#12 /var/www/mauscloud/index.php(25): OC::handleRequest()\\n#13 {main}\"}}","CustomMessage":"hash_hkdf(): Argument #2 ($key) cannot be empty in file '/var/www/mauscloud/lib/private/Security/Crypto.php' line 147"}}


Configuration

Nextcloud

Output of occ config:list :

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "mauscloud.patschull.de"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "33.0.0.16",
        "overwrite.cli.url": "https:\/\/mauscloud.patschull.de",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "default_phone_region": "DE",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "mail_smtpauth": "1",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "log_type": "file",
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "loglevel": "1",
        "logdateformat": "F d, Y H:i:s",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "filelocking.enabled": "true",
        "enable_previews": "true",
        "enabledPreviewProviders": [
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\Movie",
            "OC\\Preview\\PDF",
            "OC\\Preview\\MP3",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown"
        ],
        "preview_max_x": "1024",
        "preview_max_y": "768",
        "preview_max_scale_factor": "1",
        "auth.bruteforce.protection.enabled": "true",
        "trashbin_retention_obligation": "auto,7",
        "skeletondirectory": "",
        "defaultapp": "file",
        "activity_expire_days": "14",
        "integrity.check.disabled": "false",
        "updater.release.channel": "stable",
        "maintenance_window_start": 2,
        "maintenance": false,
        "theme": "",
        "serverid": "173",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": "0",
            "timeout": "0.0"
        },
        "memcache.locking": "\\OC\\Memcache\\Redis"
    },
    "apps": {
        "activity": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": "filesystem"
        },
        "admin_audit": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "logging"
        },
        "app_api": {
            "enabled": "yes",
            "installed_version": "33.0.0",
            "types": ""
        },
        "backgroundjob": {
            "lastjob": "1"
        },
        "bruteForce": {
            "whitelist_2": "109.193.64.223\/32",
            "whitelist_3": "91.1.231.17\/32",
            "whitelist_2_comment": "Mausnest",
            "whitelist_3_comment": "Gm\u00fcnd"
        },
        "bruteforcesettings": {
            "apply_allowlist_to_ratelimit": "1",
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "calendar": {
            "enabled": "[\"users_intern\"]",
            "installed_version": "6.2.1",
            "types": ""
        },
        "circles": {
            "enabled": "yes",
            "installed_version": "33.0.0",
            "loopback_tmp_scheme": "https",
            "maintenance_run": "0",
            "maintenance_update": "{\"maximum\":3,\"3\":1774109702,\"2\":1774111202,\"1\":1774111501}",
            "migration_22": "1",
            "migration_run": "0",
            "types": "filesystem,dav"
        },
        "cloud_federation_api": {
            "enabled": "yes",
            "installed_version": "1.17.0",
            "types": "filesystem"
        },
        "comments": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "logging"
        },
        "contacts": {
            "enabled": "[\"users_intern\"]",
            "installed_version": "8.4.1",
            "types": "dav"
        },
        "contactsinteraction": {
            "enabled": "[\"admin\",\"users_intern\"]",
            "installed_version": "1.14.1",
            "types": "dav"
        },
        "core": {
            "backgroundjobs_mode": "cron",
            "emailTestSuccessful": "1",
            "enterpriseLogoChecked": "yes",
            "files_metadata_installed": "1",
            "installed.bundles": "[\"CoreBundle\"]",
            "installedat": "1538765343.9658",
            "lastcron": 1774111501,
            "lastupdateResult": "[]",
            "lastupdatedat": 1774109845,
            "metadataGenerationDone": true,
            "moveavatarsdone": "yes",
            "newUser.sendEmail": "no",
            "previewMovedDone": true,
            "previewsCleanedUp": "1",
            "public_files": "files_sharing\/public.php",
            "public_webdav": "dav\/appinfo\/v1\/publicwebdav.php",
            "scss.variables": "c628b9e2101e67c57993cab13888aa9b",
            "shareapi_only_share_with_group_members": "no",
            "shareapi_restrict_user_enumeration_to_group": "yes",
            "theming.variables": "5aa3eee9c54ef2d7bfff805cd569b985",
            "vendor": "nextcloud",
            "files_metadata": {
                "photos-original_date_time": {
                    "value": null,
                    "type": "int",
                    "etag": "",
                    "indexed": true,
                    "editPermission": 0
                },
                "photos-exif": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-ifd0": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-size": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-gps": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-place": {
                    "value": null,
                    "type": "string",
                    "etag": "",
                    "indexed": true,
                    "editPermission": 0
                },
                "files-live-photo": {
                    "value": null,
                    "type": "string",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "blurhash": {
                    "value": null,
                    "type": "string",
                    "etag": "8413b73c23e5f00576874c544ebc1dc9",
                    "indexed": false,
                    "editPermission": 0
                }
            },
            "oc.integritycheck.checker": "[]"
        },
        "dashboard": {
            "enabled": "[\"users_intern\"]",
            "installed_version": "7.13.0",
            "types": ""
        },
        "dav": {
            "buildCalendarReminderIndex": "yes",
            "buildCalendarSearchIndex": "yes",
            "builtSocialSearchIndex": "yes",
            "chunks_migrated": "1",
            "enabled": "yes",
            "installed_version": "1.36.0",
            "regeneratedBirthdayCalendarsForYearFix": "yes",
            "types": "filesystem"
        },
        "federatedfilesharing": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": ""
        },
        "federation": {
            "enabled": "no",
            "installed_version": "1.22.0",
            "types": "authentication"
        },
        "files": {
            "cronjob_scan_files": "500",
            "default_quota": "137,4 GB",
            "enabled": "yes",
            "installed_version": "2.5.0",
            "mimetype_version": "33.0.0.16",
            "types": "filesystem"
        },
        "files_downloadactivity": {
            "enabled": "no",
            "installed_version": "1.17.0",
            "types": "filesystem"
        },
        "files_downloadlimit": {
            "enabled": "yes",
            "installed_version": "5.1.0-dev.0",
            "types": ""
        },
        "files_pdfviewer": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "files_reminders": {
            "enabled": "yes",
            "installed_version": "1.6.0",
            "types": ""
        },
        "files_rightclick": {
            "enabled": "no",
            "installed_version": "1.6.0",
            "types": ""
        },
        "files_sharing": {
            "enabled": "yes",
            "installed_version": "1.25.2",
            "types": "filesystem"
        },
        "files_texteditor": {
            "enabled": "no",
            "installed_version": "2.8.0",
            "types": ""
        },
        "files_trashbin": {
            "background_job_expire_trash_offset": 0,
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "filesystem,dav"
        },
        "files_versions": {
            "enabled": "yes",
            "installed_version": "1.26.0",
            "types": "filesystem,dav"
        },
        "firstrunwizard": {
            "enabled": "no",
            "installed_version": "2.12.0",
            "types": "logging"
        },
        "gallery": {
            "enabled": "no",
            "installed_version": "18.4.0",
            "types": ""
        },
        "logreader": {
            "enabled": "yes",
            "installed_version": "6.0.0",
            "shownLevels": "[3,4]",
            "types": "logging"
        },
        "lookup_server_connector": {
            "enabled": "yes",
            "installed_version": "1.21.0",
            "types": "authentication"
        },
        "nextcloud_announcements": {
            "enabled": "yes",
            "installed_version": "5.0.0",
            "pub_date": "Thu, 24 Oct 2019 00:00:00 +0200",
            "types": "logging"
        },
        "notifications": {
            "enabled": "yes",
            "installed_version": "6.0.0",
            "types": "logging"
        },
        "oauth2": {
            "enabled": "yes",
            "installed_version": "1.21.0",
            "types": "authentication"
        },
        "password_policy": {
            "enabled": "yes",
            "installed_version": "5.0.0-dev.0",
            "maximumLoginAttempts": "10",
            "types": "authentication"
        },
        "photos": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "lastPlaceMappedUser": "t_mickey",
            "lastPlaceMappingDone": "true",
            "types": "dav,authentication"
        },
        "privacy": {
            "enabled": "[\"users_intern\"]",
            "installed_version": "5.0.0-dev.0",
            "readableLocation": "de",
            "types": ""
        },
        "profile": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "provisioning_api": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "prevent_group_restriction"
        },
        "recommendations": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "related_resources": {
            "enabled": "yes",
            "installed_version": "4.0.0-dev.0",
            "types": ""
        },
        "serverinfo": {
            "cached_count_appdata_files": 2543,
            "cached_count_filecache": 427299,
            "cached_count_storages": "15",
            "enabled": "[\"admin\"]",
            "installed_version": "5.0.0-dev.0",
            "size_appdata_storage": -1,
            "types": ""
        },
        "settings": {
            "enabled": "yes",
            "installed_version": "1.16.0",
            "types": ""
        },
        "sharebymail": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "filesystem"
        },
        "sharerenamer": {
            "enabled": "no",
            "installed_version": "3.2.0",
            "types": ""
        },
        "sharingpath": {
            "default_copy_prefix": "",
            "default_enabled": "yes",
            "default_sharing_folder": "",
            "enabled": "no",
            "installed_version": "0.4.4",
            "types": ""
        },
        "support": {
            "SwitchUpdaterServerHasRun": "yes",
            "enabled": "yes",
            "installed_version": "5.0.0",
            "types": "session"
        },
        "survey_client": {
            "enabled": "no",
            "installed_version": "5.0.0-dev.0",
            "last_sent": 1772224801,
            "types": "",
            "last_report": "{\"id\":\"oc112cafsvkg\",\"items\":[[\"server\",\"version\",\"32.0.5.0\"],[\"server\",\"code\",\"other\"],[\"server\",\"enable_avatars\",\"yes\"],[\"server\",\"enable_previews\",\"yes\"],[\"server\",\"memcache.local\",\"\\\\OC\\\\Memcache\\\\APCu\"],[\"server\",\"memcache.distributed\",\"none\"],[\"server\",\"asset-pipeline.enabled\",\"no\"],[\"server\",\"filelocking.enabled\",\"yes\"],[\"server\",\"memcache.locking\",\"\\\\OC\\\\Memcache\\\\Redis\"],[\"server\",\"debug\",\"no\"],[\"server\",\"cron\",\"cron\"],[\"php\",\"version\",\"8.3.4\"],[\"php\",\"memory_limit\",-1],[\"php\",\"max_execution_time\",0],[\"php\",\"upload_max_filesize\",2097152],[\"database\",\"type\",\"mysql\"],[\"database\",\"version\",\"10.6.17\"],[\"database\",\"size\",1167622144],[\"apps\",\"activity\",\"5.0.0-dev.0\"],[\"apps\",\"admin_audit\",\"1.22.0\"],[\"apps\",\"app_api\",\"32.0.0\"],[\"apps\",\"bruteforcesettings\",\"5.0.0-dev.0\"],[\"apps\",\"calendar\",\"6.2.1\"],[\"apps\",\"circles\",\"32.0.0\"],[\"apps\",\"cloud_federation_api\",\"1.16.0\"],[\"apps\",\"comments\",\"1.22.0\"],[\"apps\",\"contacts\",\"8.3.4\"],[\"apps\",\"contactsinteraction\",\"1.13.1\"],[\"apps\",\"dashboard\",\"7.12.0\"],[\"apps\",\"dav\",\"1.34.2\"],[\"apps\",\"federatedfilesharing\",\"1.22.0\"],[\"apps\",\"federation\",\"1.22.0\"],[\"apps\",\"files\",\"2.4.0\"],[\"apps\",\"files_downloadactivity\",\"disabled\"],[\"apps\",\"files_downloadlimit\",\"5.0.0-dev.0\"],[\"apps\",\"files_pdfviewer\",\"5.0.0-dev.0\"],[\"apps\",\"files_reminders\",\"1.5.0\"],[\"apps\",\"files_rightclick\",\"disabled\"],[\"apps\",\"files_sharing\",\"1.24.1\"],[\"apps\",\"files_texteditor\",\"disabled\"],[\"apps\",\"files_trashbin\",\"1.22.0\"],[\"apps\",\"files_versions\",\"1.25.0\"],[\"apps\",\"firstrunwizard\",\"disabled\"],[\"apps\",\"gallery\",\"disabled\"],[\"apps\",\"logreader\",\"5.0.0-dev.0\"],[\"apps\",\"lookup_server_connector\",\"1.20.0\"],[\"apps\",\"nextcloud_announcements\",\"4.0.0-dev.0\"],[\"apps\",\"notifications\",\"5.0.0-dev.0\"],[\"apps\",\"oauth2\",\"1.20.0\"],[\"apps\",\"password_policy\",\"4.0.0-dev.0\"],[\"apps\",\"photos\",\"5.0.0-dev.1\"],[\"apps\",\"privacy\",\"4.0.0-dev.0\"],[\"apps\",\"profile\",\"1.1.0\"],[\"apps\",\"provisioning_api\",\"1.22.0\"],[\"apps\",\"recommendations\",\"5.0.0-dev.0\"],[\"apps\",\"related_resources\",\"3.0.0-dev.0\"],[\"apps\",\"serverinfo\",\"4.0.0-dev.0\"],[\"apps\",\"settings\",\"1.15.1\"],[\"apps\",\"sharebymail\",\"1.22.0\"],[\"apps\",\"sharerenamer\",\"disabled\"],[\"apps\",\"sharingpath\",\"disabled\"],[\"apps\",\"support\",\"4.0.0-dev.0\"],[\"apps\",\"survey_client\",\"4.0.0-dev.0\"],[\"apps\",\"systemtags\",\"1.22.0\"],[\"apps\",\"tasks\",\"0.17.1\"],[\"apps\",\"text\",\"6.0.1\"],[\"apps\",\"theming\",\"2.7.0\"],[\"apps\",\"twofactor_backupcodes\",\"1.21.0\"],[\"apps\",\"updatenotification\",\"1.22.0\"],[\"apps\",\"user_status\",\"1.12.0\"],[\"apps\",\"user_usage_report\",\"3.0.0\"],[\"apps\",\"viewer\",\"5.0.0-dev.0\"],[\"apps\",\"weather_status\",\"1.12.0\"],[\"apps\",\"webhook_listeners\",\"1.3.0\"],[\"apps\",\"workflowengine\",\"2.14.0\"],[\"stats\",\"num_files\",1298274],[\"stats\",\"num_users\",13],[\"stats\",\"num_storages\",15],[\"stats\",\"num_storages_local\",2],[\"stats\",\"num_storages_home\",13],[\"stats\",\"num_storages_other\",0],[\"stats\",\"num_comments\",0],[\"stats\",\"num_comment_markers\",0],[\"stats\",\"num_systemtags\",0],[\"stats\",\"num_systemtags_mappings\",0],[\"files_sharing\",\"num_shares\",48],[\"files_sharing\",\"num_shares_user\",23],[\"files_sharing\",\"num_shares_groups\",2],[\"files_sharing\",\"num_shares_link\",21],[\"files_sharing\",\"num_shares_link_no_password\",21],[\"files_sharing\",\"num_fed_shares_sent\",0],[\"files_sharing\",\"num_fed_shares_received\",0],[\"files_sharing\",\"permissions_0_1\",1],[\"files_sharing\",\"permissions_3_1\",3],[\"files_sharing\",\"permissions_0_5\",1],[\"files_sharing\",\"permissions_0_7\",1],[\"files_sharing\",\"permissions_0_15\",3],[\"files_sharing\",\"permissions_0_17\",3],[\"files_sharing\",\"permissions_3_17\",18],[\"files_sharing\",\"permissions_0_21\",2],[\"files_sharing\",\"permissions_1_21\",2],[\"files_sharing\",\"permissions_2_21\",2],[\"files_sharing\",\"permissions_0_23\",1],[\"files_sharing\",\"permissions_0_31\",11],[\"encryption\",\"enabled\",\"no\"],[\"encryption\",\"default_module\",\"no\"]]}"
        },
        "systemtags": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "logging"
        },
        "tasks": {
            "enabled": "[\"tasks\"]",
            "installed_version": "0.17.1",
            "types": ""
        },
        "text": {
            "enabled": "[\"users_intern\"]",
            "installed_version": "7.0.0-dev.3",
            "types": "dav"
        },
        "theming": {
            "backgroundMime": "image\/jpeg",
            "background_color": "#485580",
            "cachebuster": "21",
            "enabled": "yes",
            "faviconMime": "image\/gif",
            "installed_version": "2.8.0",
            "logoDimensions": "324x400",
            "logoMime": "image\/gif",
            "logoheaderMime": "image\/gif",
            "name": "MausCloud",
            "primary_color": "#485580",
            "slogan": "***REMOVED SENSITIVE VALUE***",
            "types": "logging",
            "url": "***REMOVED SENSITIVE VALUE***"
        },
        "twofactor_backupcodes": {
            "enabled": "yes",
            "installed_version": "1.22.0",
            "types": ""
        },
        "twofactor_totp": {
            "enabled": "yes",
            "installed_version": "15.0.0-dev.0",
            "types": ""
        },
        "updatenotification": {
            "bruteforcesettings": "2.2.0",
            "calendar": "6.2.1",
            "contacts": "8.3.5",
            "core": "33.0.0.16",
            "enabled": "[\"admin\",\"users_intern\"]",
            "files_downloadactivity": "1.16.0",
            "files_rightclick": "0.15.1",
            "installed_version": "1.23.0",
            "sharerenamer": "3.2.0",
            "tasks": "0.16.1",
            "types": "",
            "update_check_errors": 0
        },
        "user_status": {
            "enabled": "[\"users_intern\"]",
            "installed_version": "1.13.0",
            "types": ""
        },
        "user_usage_report": {
            "enabled": "yes",
            "installed_version": "4.0.0",
            "types": "filesystem"
        },
        "viewer": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "weather_status": {
            "enabled": "yes",
            "installed_version": "1.13.0",
            "types": ""
        },
        "webhook_listeners": {
            "enabled": "yes",
            "installed_version": "1.5.0",
            "types": "filesystem"
        },
        "workflowengine": {
            "enabled": "yes",
            "installed_version": "2.15.0",
            "types": "filesystem"
        }
    }
}

Apps

The output of occ app:list :

Enabled:

activity: 6.0.0-dev.0
admin_audit: 1.23.0
app_api: 33.0.0
bruteforcesettings: 6.0.0-dev.0
calendar: 6.2.1
circles: 33.0.0
cloud_federation_api: 1.17.0
comments: 1.23.0
contacts: 8.4.1
contactsinteraction: 1.14.1
dashboard: 7.13.0
dav: 1.36.0
federatedfilesharing: 1.23.0
files: 2.5.0
files_downloadlimit: 5.1.0-dev.0
files_pdfviewer: 6.0.0-dev.0
files_reminders: 1.6.0
files_sharing: 1.25.2
files_trashbin: 1.23.0
files_versions: 1.26.0
logreader: 6.0.0
lookup_server_connector: 1.21.0
nextcloud_announcements: 5.0.0
notifications: 6.0.0
oauth2: 1.21.0
password_policy: 5.0.0-dev.0
photos: 6.0.0-dev.0
privacy: 5.0.0-dev.0
profile: 1.2.0
provisioning_api: 1.23.0
recommendations: 6.0.0-dev.0
related_resources: 4.0.0-dev.0
serverinfo: 5.0.0-dev.0
settings: 1.16.0
sharebymail: 1.23.0
support: 5.0.0
systemtags: 1.23.0
tasks: 0.17.1
text: 7.0.0-dev.3
theming: 2.8.0
twofactor_backupcodes: 1.22.0
twofactor_totp: 15.0.0-dev.0
updatenotification: 1.23.0
user_status: 1.13.0
user_usage_report: 4.0.0
viewer: 6.0.0-dev.0
weather_status: 1.13.0
webhook_listeners: 1.5.0
workflowengine: 2.15.0

Disabled:

encryption: 2.21.0
federation: 1.23.0 (installed 1.22.0)
files_external: 1.25.1
firstrunwizard: 6.0.0-dev.0 (installed 2.12.0)
survey_client: 5.0.0-dev.0 (installed 5.0.0-dev.0)
suspicious_login: 11.0.0-dev.0
twofactor_nextcloud_notification: 7.0.0
user_ldap: 1.24.0

I would appreciate any idea how to fix this.
Thanks a lot!

Before anyone asks: yes, I saw the other two threads in this forum with the similar title but they did not provide a solution to me.

What I know:

  • Not having a backup from my config.php was a terrible mistake.
  • My issue most likely is related to the ‘secret’ key, which is not empty now but probably different from the value I had in my original Nextcloud instance.

Claude Sonnet 4.6 recommended the following:

The keypair stored in the database was encrypted with the old instance’s secret. Since you migrated, if the secret changed, decryption fails. So regenerate Identity Proof Keys:

# Delete the corrupted/mismatched identity proof keys

sudo -u www-data php /var/www/mauscloud/occ config:app:delete core identityproof_key_public
sudo -u www-data php /var/www/mauscloud/occ config:app:delete core identityproof_key_private

# Force regeneration
sudo -u www-data php /var/www/mauscloud/occ maintenance:repair

It tried this, but unfortunately it did not solve the isssue :slightly_frowning_face:

What do I need to reset an how? I have only six users on my Nextcloud instance, so I could set the passwords again (as long I am able to log in as admin) - but will this be enough? File sync and user login does work!

How would I reset the secrets for the ‘index’ and ‘core’ application, which seems to be related to the Administration settings and Background jobs?

Kind regards,
Michael