Nextcloud Office lost/won't connect to Collabora Servers

Hello everyone my Nextcloud Office is giving me grief. It’s been running great with no issues until recently when it keeps giving me an error. I’m not sure what to do. I’ve seen similiar issues on here and none of those issues helped. Whether I run Collabora with the “Use my own server option” or CODE, It will not connect and gives me totally different errors. Please help this feature is critical to my org and I need it fixed asap.

Could not establish connection to the Collabora Online server.

Failed to connect to the remote server: Client error: GET https://mydomain/custom_apps/richdocumentscode/proxy.php?req=/hosting/discovery resulted in a `400 Bad Request

Please fill out the support template otherwise it’ll be challenging for anyone here to be very helpful.

Basic Info

Nextcloud Server version: 31.0.5
Operating system and version (e.g., Ubuntu 24.04): Debian GNU/Linux 12 (bookworm) x86_64
Web server and version (e.g, Apache 2.4.25): ?
Reverse proxy and version _(e.g. nginx 1.27.2):  n/a
PHP version (e.g, 8.3): 8.3.21
Is this the first time you’ve seen this error? (Yes / No):Yes
When did this problem seem to first start? April 2025
Installation method :AIO
Are you using Cloudflare, mod_security, or similar? (Yes / No)

Summary

My Collabora has stopped working it gives the following error in the Nextcloud Office settings

Could not establish connection to the Collabora Online server.

Failed to connect to the remote server: cURL error 28: Operation timed out after 5002 milliseconds with 0 bytes received (see libcurl - Error Codes) for https://cpusacleveland.net/hosting/discovery

nextcloud.log

{"reqId":"newnJh1uHO5mLUMgG6nK","level":2,"time":"2025-06-02T02:03:13+00:00","remoteAddr":"127.0.0.1","user":"Lexi","app":"settings","method":"GET","url":"/settings/apps","message":"Value type is set to zero (0) in database. This is fine only during the upgrade process from 28 to
29.","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0","version":"31.0.5.1","data":{"app":"settings","key":"appstore-fetcher-lastFailure"}}
{"reqId":"newnJh1uHO5mLUMgG6nK","level":2,"time":"2025-06-02T02:03:13+00:00","remoteAddr":"127.0.0.1","user":"Lexi","app":"appstoreFetcher","method":"GET","url":"/settings/apps","message":"unknown config key","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101
Firefox/139.0","version":"31.0.5.1","exception":{"Exception":"OCP\\Exceptions\\AppConfigUnknownKeyException","Message":"unknown config
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My browser is Firefox

Configuration

{
“system”: {
“one-click-instance”: true,
“one-click-instance.user-limit”: 100,
“memcache.local”: “\OC\Memcache\APCu”,
“apps_paths”: [
{
“path”: “/var/www/html/apps”,
“url”: “/apps”,
“writable”: false
},
{
“path”: “/var/www/html/custom_apps”,
“url”: “/custom_apps”,
“writable”: true
}
],
“appsallowlist”: false,
“check_data_directory_permissions”: false,
“memcache.distributed”: “\OC\Memcache\Redis”,
“memcache.locking”: “\OC\Memcache\Redis”,
“redis”: {
“host”: “REMOVED SENSITIVE VALUE”,
“password”: “REMOVED SENSITIVE VALUE”,
“port”: 6379
},
“overwritehost”: “REDACTED DOMAIN”,
“overwriteprotocol”: “https”,
“passwordsalt”: “REMOVED SENSITIVE VALUE”,
“secret”: “REMOVED SENSITIVE VALUE”,
“trusted_domains”: [
“localhost”,
“REDACTED Domain”
],
“datadirectory”: “REMOVED SENSITIVE VALUE”,
“dbtype”: “pgsql”,
“version”: “31.0.5.1”,
“overwrite.cli.url”: “REDACTED”,
“dbname”: “REMOVED SENSITIVE VALUE”,
“dbhost”: “REMOVED SENSITIVE VALUE”,
“dbport”: “”,
“dbtableprefix”: “oc_”,
“dbuser”: “REMOVED SENSITIVE VALUE”,
“dbpassword”: “REMOVED SENSITIVE VALUE”,
“installed”: true,
“instanceid”: “REMOVED SENSITIVE VALUE”,
“maintenance”: false,
“updatedirectory”: “/nc-updater”,
“loglevel”: “2”,
“log_type”: “file”,
“logfile”: “/var/www/html/data/nextcloud.log”,
“log_rotate_size”: “10485760”,
“log.condition”: {
“apps”: [
“admin_audit”
]
},
“preview_max_x”: “2048”,
“preview_max_y”: “2048”,
“jpeg_quality”: “60”,
“enabledPreviewProviders”: {
“1”: “OC\Preview\Image”,
“2”: “OC\Preview\MarkDown”,
“3”: “OC\Preview\MP3”,
“4”: “OC\Preview\TXT”,
“5”: “OC\Preview\OpenDocument”,
“6”: “OC\Preview\Movie”,
“7”: “OC\Preview\Krita”,
“0”: “OC\Preview\Imaginary”,
“23”: “OC\Preview\ImaginaryPDF”
},
“enable_previews”: true,
“upgrade.disable-web”: true,
“mail_smtpmode”: “smtp”,
“trashbin_retention_obligation”: “auto, 30”,
“versions_retention_obligation”: “auto, 30”,
“activity_expire_days”: “30”,
“simpleSignUpLink.shown”: false,
“share_folder”: “/Shared”,
“one-click-instance.link”: “https://nextcloud.com/all-in-one/”,
“upgrade.cli-upgrade-link”: “https://github.com/nextcloud/all-in-one/discussions/2726”,
“maintenance_window_start”: 100,
“allow_local_remote_servers”: true,
“davstorage.request_timeout”: 3600,
“htaccess.RewriteBase”: “/”,
“dbpersistent”: false,
“auth.bruteforce.protection.enabled”: true,
“ratelimit.protection.enabled”: true,
“files_external_allow_create_new_local”: false,
“trusted_proxies”: “REMOVED SENSITIVE VALUE”,
“preview_imaginary_url”: “REMOVED SENSITIVE VALUE”,
“preview_imaginary_key”: “REMOVED SENSITIVE VALUE”,
“mail_sendmailmode”: “smtp”,
“mail_smtphost”: “REMOVED SENSITIVE VALUE”,
“mail_smtpauth”: 1,
“mail_smtpname”: “REMOVED SENSITIVE VALUE”,
“mail_smtppassword”: “REMOVED SENSITIVE VALUE”,
“mail_smtpport”: “465”,
“mail_from_address”: “REMOVED SENSITIVE VALUE”,
“mail_domain”: “REMOVED SENSITIVE VALUE”,
“mail_smtpsecure”: “ssl”,
“documentation_url.server_logs”: “https://github.com/nextcloud/all-in-one/discussions/5425”,
“updater.release.channel”: “stable”,
“app_install_overwrite”: [
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“wopi”
],
“DOMAIN”:[REDACTED]
}
}

App List

Enabled:

  • activity: 4.0.0
  • admin_audit: 1.21.0
  • app_api: 5.0.2
  • bruteforcesettings: 4.0.0
  • calendar: 5.3.0
  • cfg_share_links: 7.0.1
  • circles: 31.0.0
  • cloud_federation_api: 1.14.0
  • collectives: 2.17.1
  • comments: 1.21.0
  • contacts: 7.1.1
  • contactsinteraction: 1.12.0
  • context_chat: 4.3.0
  • dashboard: 7.11.0
  • dav: 1.33.0
  • deck: 1.15.1
  • federatedfilesharing: 1.21.0
  • federation: 1.21.0
  • files: 2.3.1
  • files_antivirus: 6.0.2
  • files_downloadlimit: 4.0.0
  • files_external: 1.23.0
  • files_fulltextsearch: 31.0.0
  • files_pdfviewer: 4.0.0
  • files_reminders: 1.4.0
  • files_sharing: 1.23.1
  • files_trashbin: 1.21.0
  • files_versions: 1.24.0
  • fileslibreofficeedit: 2.0.1
  • firstrunwizard: 4.0.0
  • forms: 5.1.0
  • fulltextsearch: 31.0.0
  • fulltextsearch_elasticsearch: 31.0.0
  • libresign: 11.2.3
  • logreader: 4.0.0
  • lookup_server_connector: 1.19.0
  • memegen: 1.1.3
  • music: 2.1.4
  • nextcloud-aio: 0.7.0
  • nextcloud_announcements: 3.0.0
  • notes: 4.12.1
  • notifications: 4.0.0
  • notify_push: 1.1.0
  • oauth2: 1.19.1
  • occweb: 0.2.3
  • password_policy: 3.0.0
  • photos: 4.0.0-dev.1
  • polls: 8.0.0-beta8
  • privacy: 3.0.0
  • profile: 1.0.0
  • provisioning_api: 1.21.0
  • recommendations: 4.0.0
  • related_resources: 2.0.0
  • richdocuments: 8.7.0
  • richdocumentscode: 25.4.202
  • serverinfo: 3.0.0
  • settings: 1.14.0
  • sharebymail: 1.21.0
  • socialsharing_telegram: 3.3.0
  • spreed: 21.1.0
  • support: 3.0.0
  • survey_client: 3.0.0
  • systemtags: 1.21.1
  • talk_matterbridge: 1.31.1026000
  • tasks: 0.16.1
  • text: 5.0.0
  • theming: 2.6.1
  • twofactor_backupcodes: 1.20.0
  • twofactor_totp: 13.0.0-dev.0
  • twothousandandfortyeight: 1.0.2
  • user_status: 1.11.0
  • viewer: 4.0.0
  • weather_status: 1.11.0
  • webhook_listeners: 1.2.0
  • whiteboard: 1.0.5
  • workflowengine: 2.13.0
    Disabled:
  • assistant: 2.4.0 (installed 2.4.0)
  • encryption: 2.19.0
  • integration_peertube: 1.2.0 (installed 1.2.0)
  • integration_youtube: 0.3.1 (installed 0.3.1)
  • mail: 5.1.1 (installed 5.1.1)
  • officeonline: 3.1.0 (installed 3.1.0)
  • snappymail: 2.38.2 (installed 2.38.2)
  • suspicious_login: 9.0.1
  • twofactor_nextcloud_notification: 5.0.0
  • unsplash: 3.1.0 (installed 3.1.0)
  • updatenotification: 1.21.0 (installed 1.19.1)
  • user_ldap: 1.22.0
  • wopi: 3.5.11 (installed 3.5.11)

CODE suggests using a reverse proxy → Collabora integration guide

Okay, I will read it, but it’s strange because I didn’t use CODE or a reverse proxy when it was running.

what’s this then?

please be clear about your setup

Oh yea, I was out of options, I was trying to get it to work with CODE after it went down, when it was working it was set to the first option. “Use your own server”.

Office integration mostly doesn’t “just work” as the protocol is rather complex - see Collabora integration guide for details.
AiO runs a “separate” instance of “own server” CODE - the specialty it is configured to share the domain with Nextcloud - it’s not bad itself but makes it little harder to understand and separate the components for troubleshooting. this instance uses e.g. https://cloud.mydomain.tld/hosting/discovery and https://cloud.mydomain.tld/hosting/capabilities to advertise its functionality.

your URL

belongs to a “built-in” CODE variant.. but IMHO there is no good reason to use it at all.

At the end your system (including external parts like reverse proxy) must be configured in a proper way and try and error or mix and match will probably fail.

collabora-built-in reverseproxy aio

I’m not sure what to do. It worked with the first option right out of the box. :confused: