I'm unable to log into a Checkmk 1.6.0p21 dashboard through the web interface. I have access to the machine running it and nothing I do on it makes a difference. It always gives the error "Invalid credentials." with no further explanation or anything in the logs.
I found this post on ServerFault too Check_mk cannot login - invalid credentials, however this variable in the answers doesn't seem to exist in 1.6.0p21 anymore.
I'm considering upgrading to a few patches higher, however we have many Checkmk servers running with Livestatus, so we can't deviate from this version too much or else it could break the distributed monitoring.
I've reset the password with htpasswd and it changes the file just fine, the wato/users.mk file gets changed, the account isn't locked, the file permissions are okay.
I've ran out of ideas on what to check, has anyone encountered this issue and could assist in fixing it?