Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 28.0.1.1
Operating system and version (eg, Ubuntu 20.04): Debian 12.4 bookworm
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.22.1
PHP version (eg, 7.4): 8.2.14
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Go to Page Administration - Overview
The output of your Nextcloud log in Admin > Logging:
Empty page
config.php
<?php
$CONFIG = array (
'instanceid' => 'xxx',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => 'ardbeg',
1 => 'whiskykult.ddnss.de',
),
'datadirectory' => '/home/nextcloud',
'dbtype' => 'mysql',
'version' => '28.0.1.1',
'overwrite.cli.url' => 'http://ardbeg/nextcloud',
'dbname' => 'nextclouddb',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextclouduser',
'dbpassword' => 'password',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' => 'whiskykult.de',
'mail_smtphost' => 'xxx',
'mail_smtpport' => '587',
'app_install_overwrite' =>
array (
0 => 'dicomviewer',
1 => 'dashboardcharts',
2 => 'admin_notifications',
3 => 'breezedark',
4 => 'richdocumentscode',
5 => 'apporder',
),
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'memcache.local' => '\\OC\\Memcache\\APCu',
'default_phone_region' => 'DE',
'enforce_theme' => 'breezedark',
'mail_smtpsecure' => 'tls',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpname' => 'xxx',
'mail_smtppassword' => 'xxx',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.0,
),
);
The output of your Apache/nginx/system log in /var/log/____:
192.168.42.187 - - [19/Jan/2024:20:22:51 +0100] "GET /nextcloud/ocs/v2.php/apps/serverinfo/api/v1//basicdata?format=json HTTP/1.1" 200 252 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:52 +0100] "GET /nextcloud/apps/serverinfo/update HTTP/1.1" 200 263 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:53 +0100] "GET /nextcloud/apps/serverinfo/update HTTP/1.1" 200 263 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:53 +0100] "GET /nextcloud/ocs/v2.php/apps/serverinfo/api/v1//basicdata?format=json HTTP/1.1" 200 253 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:54 +0100] "GET /nextcloud/apps/serverinfo/update HTTP/1.1" 200 263 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:55 +0100] "GET /nextcloud/apps/serverinfo/update HTTP/1.1" 200 263 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:55 +0100] "GET /nextcloud/ocs/v2.php/apps/serverinfo/api/v1//basicdata?format=json HTTP/1.1" 200 252 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:56 +0100] "GET /nextcloud/apps/serverinfo/update HTTP/1.1" 200 263 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:57 +0100] "GET /nextcloud/apps/serverinfo/update HTTP/1.1" 200 262 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
192.168.42.187 - - [19/Jan/2024:20:22:57 +0100] "GET /nextcloud/ocs/v2.php/apps/serverinfo/api/v1//basicdata?format=json HTTP/1.1" 200 253 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
{"reqId":"9TOifPAGBWgd3C2yjNNL","level":3,"time":"2024-01-17T12:09:58+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/mail/api/messages/15044/dkim","message":"Undefined array key 1 at /var/www/html/nextcloud/apps/mail/vendor/phpmailer/dkimvalidator/src/Validator.php#52","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"LzrX0fWfqrS2xF9z5tIi","level":3,"time":"2024-01-17T12:10:41+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/mail/api/messages/15043/dkim","message":"Undefined array key 1 at /var/www/html/nextcloud/apps/mail/vendor/phpmailer/dkimvalidator/src/Validator.php#52","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"LzrX0fWfqrS2xF9z5tIi","level":3,"time":"2024-01-17T12:10:41+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/mail/api/messages/15043/dkim","message":"Undefined array key \"c\" at /var/www/html/nextcloud/apps/mail/vendor/phpmailer/dkimvalidator/src/Validator.php#86","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"LzrX0fWfqrS2xF9z5tIi","level":3,"time":"2024-01-17T12:10:41+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/mail/api/messages/15043/dkim","message":"Undefined array key 1 at /var/www/html/nextcloud/apps/mail/vendor/phpmailer/dkimvalidator/src/Validator.php#86","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"GbqFc6djc4mzGjDqUd6U","level":3,"time":"2024-01-17T13:58:44+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/audioplayer/scanforaudiofiles?requesttoken=x%2Bzh8pZZNVJsvo%2BwRG1Y%2Bb0KXhoqYObKYAl9zeic8j4%3D%3Ag5WyhfE6UzFY9t3HFBsemtFhLHhnU5eNBk4Lut%2Fzgwg%3D","message":"Cannot modify header information - headers already sent by (output started at /var/www/html/nextcloud/lib/private/legacy/OC_EventSource.php:120) at /var/www/html/nextcloud/lib/private/AppFramework/Http/Output.php#70","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
{"reqId":"2Z8K6AKNEd5qZISCuwG9","level":3,"time":"2024-01-19T06:04:21+00:00","remoteAddr":"192.168.42.187","user":"ms","app":"internet_connection_check","method":"GET","url":"/nextcloud/settings/ajax/checksetup","message":"Cannot connect to: www.nextcloud.com","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0","version":"28.0.1.1","exception":{"Exception":"GuzzleHttp\\Exception\\ConnectException","Message":"cURL error 28: Connection timed out after 30000 milliseconds (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for http://www.nextcloud.com/","Code":0,"Trace":[{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":158,"function":"createRejection","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":110,"function":"finishError","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php","line":47,"function":"finish","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":137,"function":"__invoke","class":"GuzzleHttp\\Handler\\CurlHandler","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Http/Client/DnsPinMiddleware.php","line":161,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php","line":35,"function":"OC\\Http\\Client\\{closure}","class":"OC\\Http\\Client\\DnsPinMiddleware","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":63,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":331,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":168,"function":"transfer","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":187,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Http/Client/Client.php","line":230,"function":"request","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/html/nextcloud/apps/settings/lib/SetupChecks/InternetConnectivity.php","line":85,"function":"get","class":"OC\\Http\\Client\\Client","type":"->"},{"file":"/var/www/html/nextcloud/apps/settings/lib/SetupChecks/InternetConnectivity.php","line":68,"function":"isSiteReachable","class":"OCA\\Settings\\SetupChecks\\InternetConnectivity","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/SetupCheck/SetupCheckManager.php","line":49,"function":"run","class":"OCA\\Settings\\SetupChecks\\InternetConnectivity","type":"->"},{"file":"/var/www/html/nextcloud/apps/settings/lib/Controller/CheckSetupController.php","line":643,"function":"runAll","class":"OC\\SetupCheck\\SetupCheckManager","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":230,"function":"check","class":"OCA\\Settings\\Controller\\CheckSetupController","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":137,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":184,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1069,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":39,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","Line":210,"message":"Cannot connect to: www.nextcloud.com","exception":{},"CustomMessage":"Cannot connect to: www.nextcloud.com"}}
{"reqId":"XVfCQIg7AuA6SCZgUO5Y","level":3,"time":"2024-01-19T07:29:05+00:00","remoteAddr":"192.168.41.2","user":"ms","app":"PHP","method":"GET","url":"/nextcloud/apps/mail/api/messages/15075/dkim","message":"Undefined array key \"t\" at /var/www/html/nextcloud/apps/mail/vendor/phpmailer/dkimvalidator/src/Validator.php#140","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0","version":"28.0.1.1","data":{"app":"PHP"}}
