I have a similar issue reported here: https://code.onedev.io/onedev/server/~issues/607 I have set up Authentik with OpenID provider, to my knowledge i did everything correctly, however when trying to log in, i get a Server returned HTTP response code: 403 for URL: error. So going into the container by docker exec -it /bin/bash and trying to perform a curl on the Oauth discovery endpoint I get the following error:

curl: (35) error:0A000126:SSL routines::unexpected eof while reading

doing the same on any other machine gives me the correct json manifest. checking the curl version, it seems that the onedev docker container ships with an older version 7.81, while 7.88 is what i have on my current debian machines. googling a bit came up with this: https://stackoverflow.com/questions/72627218/openssl-error-messages-error0a000126ssl-routinesunexpected-eof-while-readin

building curl version 7.88.1 inside the container according to the stackoverflow instructions solved the problem and OneDev is able to successfully authenticate via Authentik