Issue removing connection to unavailable other Nextcloud instance

I once had a Nextcloud running at xxxxxxx.dyndns.info
This instance is no longer available and I want to remove it’s connection definition, as it still causes errors.

In NC Admin Webfront, neither at personal “External Storage” = “Es ist kein externer Speicher eingerichtet oder du hast keine Berechtigung dies zu tun.” nor at global external storage, entries can be found.

How can I get rid of the following error messages:

Warnung no app in context
ConnectException cURL error 28: Failed to connect to xxxxxxx.dyndns.info port 4431 after 5202 ms: Connection timed out (see libcurl - Error Codes) for https://xxxxxx.dyndns.info:4431/ocm-provider/
error while discovering ocm provider

StorageNotAvailableException Sabre\HTTP\ClientException: Failed to connect to xxxxxxxxx.dyndns.info port 4431 after 130047 ms: Connection timed out
External storage not available: Sabre\HTTP\ClientException: Failed to connect to xxxxxxxxxx.dyndns.info port 4431 after 130047 ms: Connection timed out

Currently running Nextcloud Hub 7 (28.0.2), but it has been like this since NC20.

Bump - nobody any idea?

Here’s the detailed error message

{"reqId":"cZ2xxxxxxx7guiv","level":2,"time":"2024-02-21T18:14:02+01:00","remoteAddr":"172.18.0.2","user":"username","app":"no app in context","method":"POST","url":"/apps/onlyoffice/track?doc=eyJ0eXAiOiJKV1xxxx8MX-vddp8kY4VtX_PHr4","message":"error while discovering ocm provider","userAgent":"--","version":"28.0.2.5","exception":{"Exception":"GuzzleHttp\\Exception\\ConnectException","Message":"cURL error 28: Failed to connect to xxxxxxxxxx.dyndns.info port 4431 after 5202 ms: Connection timed out (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://xxxxxxxxxx.dyndns.info:4431/ocm-provider/","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":158,"function":"createRejection","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","line":110,"function":"finishError","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlHandler.php","line":47,"function":"finish","class":"GuzzleHttp\\Handler\\CurlFactory","type":"::"},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":137,"function":"__invoke","class":"GuzzleHttp\\Handler\\CurlHandler","type":"->"},{"file":"/var/www/nextcloud/lib/private/Http/Client/DnsPinMiddleware.php","line":121,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/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/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":31,"function":"__invoke","class":"GuzzleHttp\\PrepareBodyMiddleware","type":"->"},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/RedirectMiddleware.php","line":71,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Middleware.php","line":63,"function":"__invoke","class":"GuzzleHttp\\RedirectMiddleware","type":"->"},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/HandlerStack.php","line":75,"function":"GuzzleHttp\\{closure}","class":"GuzzleHttp\\Middleware","type":"::","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":331,"function":"__invoke","class":"GuzzleHttp\\HandlerStack","type":"->"},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":168,"function":"transfer","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php","line":187,"function":"requestAsync","class":"GuzzleHttp\\Client","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/Http/Client/Client.php","line":230,"function":"request","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/nextcloud/lib/private/OCM/OCMDiscoveryService.php","line":91,"function":"get","class":"OC\\Http\\Client\\Client","type":"->"},{"file":"/var/www/nextcloud/apps/files_sharing/lib/External/Storage.php","line":87,"function":"discover","class":"OC\\OCM\\OCMDiscoveryService","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Mount/MountPoint.php","line":168,"function":"__construct","class":"OCA\\Files_Sharing\\External\\Storage","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Mount/MountPoint.php","line":193,"function":"createStorage","class":"OC\\Files\\Mount\\MountPoint","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/Files/Mount/MountPoint.php","line":294,"function":"getStorage","class":"OC\\Files\\Mount\\MountPoint","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Config/UserMountCache.php","line":83,"function":"getStorageRootId","class":"OC\\Files\\Mount\\MountPoint","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/SetupManager.php","line":297,"function":"registerMounts","class":"OC\\Files\\Config\\UserMountCache","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/SetupManager.php","line":221,"function":"afterUserFullySetup","class":"OC\\Files\\SetupManager","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_Util.php","line":110,"function":"setupForUser","class":"OC\\Files\\SetupManager","type":"->"},{"file":"/var/www/nextcloud/apps/onlyoffice/lib/Controller/CallbackController.php","line":510,"function":"setupFS","class":"OC_Util","type":"::"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":230,"function":"track","class":"OCA\\Onlyoffice\\Controller\\CallbackController","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":137,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":184,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":1069,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":39,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Handler/CurlFactory.php","Line":210,"message":"error while discovering ocm provider","exception":[],"remote":"https://xxxxxxxxxx.dyndns.info:4431","CustomMessage":"error while discovering ocm provider"},"id":"65d630808e428"}