Hello,
I ran into a strange problem:
I added a new ed25519 key to authorized_keys2, which worked fine. Then I went to Gitlab web interface and tried adding the ed25519 key, which failed because Gitlab cannot handle ed25519 keys yet. I made a new RSA key and added that in the Gitlab web interface. After this I cannot log into vsedach@common-lisp.net with any of the keys that were in authorized_keys2. The error message is "Permission denied (publickey)" so something must have happened to the authorized_keys file.
This seems very strange. I do not think I did anything as vsedach@common-lisp.net that would break log-ins, which leads me to believe that it was some script in Gitlab. OTOH the new RSA key does not work either, so it might be something I did through TRAMP by accident.
Can you please put this SSH key into authorized_keys:
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDc+4x1XblOzyfHAzOCbM00FB/VglYg0PvOSL8FuQKQ/ vas@t43.lan.
Thank you, Vladimir