Disable Zentyal password expiry
Just a note to others who have now bumped into this problem. My user passwords have been expiring and I found this link helpful:
Command to show your settings:
samba-tool domain passwordsettings show
Command to set passwords never to expire (in my environment that’s what I want): samba-tool domain passwordsettings set –max-pwd-age=0
That will turn off expiring passwords for your domain on systems like Zentyal or anything using samba with the password settings set.