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Sorry to hear you’re facing problems 
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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): 27.1.0
Operating system and version (eg, Ubuntu 20.04): Debian GNU/Linux 12 (bookworm)
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.57 (Debian)
PHP version (eg, 7.4): 7.4.33-1+deb11u3
The issue you are facing:
According to the NextCloud AIO dashboard, the Collabora server is running:
However, when I try to set up NextCloud Office in the admin panel, telling it that the Collabora office suite is hosted on the same subdomain and port as NextCloud itself, I get this:
I have the NextCloud AIO docker container running behind an Apache reverse proxy, of course, which is how I’m getting it to be on a subdomain, but I took my Apache2 and docker compose configurations directly from the official example one in the reverse proxy documentation, so shouldn’t this work? Port 443 on that nextcloud subdomain is being routed to port 11000 under the hood, which then connects to the docker container.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Install and set up nextcloud aio behind a reverse proxy using the configuration examples for apache2 and docker compose.
- Go through the standard setup process, try to enable NextCloud Office
- Profit???
The output of your Nextcloud log in Admin > Logging:
It’s just this over and over:
{"reqId":"81xTPaVcYmdTyhef68XD","level":3,"time":"2023-10-15T16:42:17+00:00","remoteAddr":"68.232.112.106","user":"admin","app":"richdocuments","method":"POST","url":"/apps/text/session/push","message":"Failed to fetch the Collabora capabilities endpoint: cURL error 28: Connection timed out after 45000 milliseconds (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.mydomain.com/hosting/capabilities","userAgent":"Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/118.0","version":"27.1.0.7","exception":{"Exception":"GuzzleHttp\\Exception\\ConnectException","Message":"cURL error 28: Connection timed out after 45000 milliseconds (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.mydomain.com/hosting/capabilities","Code":0,"Trace":[{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":158,"function":"createRejection","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":110,"function":"finishError","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":[["GuzzleHttp\\Handler\\CurlHandler"],"*** sensitive parameters replaced ***",["GuzzleHttp\\Handler\\CurlFactory"]]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php","line":47,"function":"finish","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":[["GuzzleHttp\\Handler\\CurlHandler"],"*** sensitive parameters replaced ***",["GuzzleHttp\\Handler\\CurlFactory"]]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":137,"function":"__invoke","class":"GuzzleHttp\\Handler\\CurlHandler","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/Http/Client/DnsPinMiddleware.php","line":114,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/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/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":63,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Client.php","line":331,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Client.php","line":168,"function":"transfer","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Client.php","line":187,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/Http/Client/Client.php","line":230,"function":"request","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***","https://nextcloud.mydomain.com/hosting/capabilities",["/mnt/ncdata/files_external/rootcerts.crt",45,[true],["Nextcloud Server Crawler","gzip"],true]]},{"file":"/var/www/html/custom_apps/richdocuments/lib/Service/CapabilitiesService.php","line":135,"function":"get","class":"OC\\Http\\Client\\Client","type":"->","args":["https://nextcloud.mydomain.com/hosting/capabilities",[45,[true]]]},{"file":"/var/www/html/custom_apps/richdocuments/lib/Service/CapabilitiesService.php","line":73,"function":"refetch","class":"OCA\\Richdocuments\\Service\\CapabilitiesService","type":"->","args":[]},{"file":"/var/www/html/custom_apps/richdocuments/lib/AppInfo/Application.php","line":90,"function":"getCapabilities","class":"OCA\\Richdocuments\\Service\\CapabilitiesService","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppFramework/Bootstrap/FunctionInjector.php","line":66,"function":"OCA\\Richdocuments\\AppInfo\\{closure}","class":"OCA\\Richdocuments\\AppInfo\\Application","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/AppFramework/Bootstrap/BootContext.php","line":50,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\FunctionInjector","type":"->","args":[["Closure"]]},{"file":"/var/www/html/custom_apps/richdocuments/lib/AppInfo/Application.php","line":145,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\BootContext","type":"->","args":[["Closure"]]},{"file":"/var/www/html/lib/private/AppFramework/Bootstrap/Coordinator.php","line":200,"function":"boot","class":"OCA\\Richdocuments\\AppInfo\\Application","type":"->","args":[["OC\\AppFramework\\Bootstrap\\BootContext"]]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":437,"function":"bootApp","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->","args":["richdocuments"]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":216,"function":"loadApp","class":"OC\\App\\AppManager","type":"->","args":["richdocuments"]},{"file":"/var/www/html/lib/private/legacy/OC_App.php","line":126,"function":"loadApps","class":"OC\\App\\AppManager","type":"->","args":[[]]},{"file":"/var/www/html/lib/base.php","line":1048,"function":"loadApps","class":"OC_App","type":"::","args":[]},{"file":"/var/www/html/index.php","line":36,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/var/www/html/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","Line":210,"message":"Failed to fetch the Collabora capabilities endpoint: cURL error 28: Connection timed out after 45000 milliseconds (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.mydomain.com/hosting/capabilities","exception":[],"CustomMessage":"Failed to fetch the Collabora capabilities endpoint: cURL error 28: Connection timed out after 45000 milliseconds (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://nextcloud.mydomain.com/hosting/capabilities"},"id":"652c1669de6bc"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'one-click-instance' => true,
'one-click-instance.user-limit' => 100,
'memcache.local' => '\\OC\\Memcache\\APCu',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'check_data_directory_permissions' => false,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'nextcloud-aio-redis',
'password' => '0e7bccfd7c50f8f5ce053f8908a1c9eef2cbe57167e085f9',
'port' => 6379,
),
'overwritehost' => 'nextcloud.mydomain.com',
'overwriteprotocol' => 'https',
'passwordsalt' => '5i/iyDDaXJDxk0r2F76GI6NyWaARWo',
'secret' => '53AZP6AdQE5c9OPWSi2AVDX9hxD3rUB7NkWbAjBQG5aAgrw6',
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'nextcloud.mydomain.com',
),
'datadirectory' => '/mnt/ncdata',
'dbtype' => 'pgsql',
'version' => '27.1.0.7',
'overwrite.cli.url' => 'https://nextcloud.mydomain.com/',
'dbname' => 'nextcloud_database',
'dbhost' => 'nextcloud-aio-database',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_nextcloud',
'dbpassword' => '47937cdec5d673db1d0ad1bb3d8eb46cc9cbcaafd2f6ad4e',
'installed' => true,
'instanceid' => 'oc2qt853149k',
'maintenance' => false,
'loglevel' => '2',
'log_type' => 'file',
'logfile' => '/var/www/html/data/nextcloud.log',
'log_rotate_size' => '10485760',
'log.condition' =>
array (
'apps' =>
array (
0 => 'admin_audit',
),
),
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'enabledPreviewProviders' =>
array (
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',
),
'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',
'updatedirectory' => '/nc-updater',
'davstorage.request_timeout' => 3600,
'htaccess.RewriteBase' => '/',
'dbpersistent' => true,
'files_external_allow_create_new_local' => false,
'trusted_proxies' =>
array (
0 => '127.0.0.1',
1 => '::1',
),
'allow_local_remote_servers' => true,
'preview_imaginary_url' => 'http://nextcloud-aio-imaginary:9000',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' => 'mydomain.com',
'twofactor_enforced' => 'true',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
);
The output of your Apache/nginx/system log in /var/log/____: attempting to access /hosting/capabilities or connect to the Collabora instance doesn’t appear to produce any log output at all.
