Desktop: Login from desktop app not possible because of access to token endpoint, "connection refused"

[steven-omaha]

Expected behaviour

Login on the NC desktop app on my server works.

Actual behaviour

Login fails, error access to token endpoint, "connection refused" (translated from German)

Steps to reproduce

1. In the nextcloud app, click "add account"
2. sign in
3. enter https://domain
4. App shows "Login Flow v2", request to alt-tab to browser
5. App shows the mentioned error
6. In the web browser, I press "login", then "grant access". Webpage shows the spinning wheel animation forever.

Client configuration

Client version: 2.6.5

Operating system: Windows 10 Pro

OS language: German

Installation path of client: C:\Program Files\Nextcloud

Server configuration

Nextcloud version: 18.0.7.1

Storage backend (external storage): mariadb

Logs

https://gist.github.com/steven-omaha/1cce6b510745df58aef5260fa0a99b13

[MarkErik]

EDIT: feel free to delete this comment if it is a different issue, the description seemed to match exactly the problem I was having too.

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Is your server by chance behind a reverse proxy?

I was setting up a server today, and I came across the same issue, and I had forgotten that there is a workaround adding 'overwriteprotocol' => 'https' to config.php. https://github.com/nextcloud/desktop/issues/1690

Nextcloud should be able to detect (or at least ask during initial server configuration) that it is behind a reverse proxy and set the HTTPS address correctly.

[steven-omaha]

Yes, mine is behind a traefik. Thanks for the hint, will check

[steven-omaha]

That fixed it.