What happened?

Login using password is no longer working.

Seems I have the same problem as described here: https://forum.syncthing.net/t/login-keeps-failing/23573

If I enter wrong credentials, I get Incorrect user name or password.
LOG then shows: Wrong credentials supplied during API authorization from 127.0.0.1:50860

If I enter correct credentials, I get Login failed, see Syncthing logs for details.
No line gets added to the LOG.

When I delete the password from config, I can access the UI (without login of course).

It doesn't matter how I store the password (syncthing generate --gui-password or using the UI after removing it from config). I replace the password by something simple to avoid problems with special chars, but even test123 resulted in the same issue.

I'm sure it worked before and I didn't change anything. I definitely had the correct password.
After getting this error, I've reset the password multiple times, updated to the latest version 1.29 (old was 1.27 I think). Nothing helped fix the problem.

My guess: Maybe something changed regarding encryption/decryption of the password (Windows update) causing a bug?

Note: I set debugging attribute to true in the tag in config. Is there is anything else I can do to generate (more) log lines and help debug this issue?

Syncthing version

v1.29.0 "Gold Grasshopper" (go1.23.4 windows-amd64) builder@github.syncthing.net 2024-12-30 03:46:20 UTC

Platform & operating system

Windows 11

Browser version

Chrome 131.0.6778.205

Relevant log output

[KAVAC] 2025/01/09 18:43:09 INFO: Wrong credentials supplied during API authorization from 127.0.0.1:50860
[KAVAC] 2025/01/09 18:43:13 INFO: Wrong credentials supplied during API authorization from 127.0.0.1:50860
[KAVAC] 2025/01/09 18:43:26 INFO: Wrong credentials supplied during API authorization from 127.0.0.1:50860