I wanted to change my AD password today. As the AD is actually a Kerberos server, I was pretty sure that kpasswd will do the trick. However, kpasswd output looked like this:
$ kpasswd Password for polonkai.gergely@EXAMPLE.LOCAL: Enter new password: Enter it again: kpasswd: Cannot find KDC for requested realm changing password
I’ve checked kinit and klist, everything looked fine. After a while it came to my mind that password changing is done through the kadmin server, not through the KDC. It seems that when I set up the Active Directory membership, the admin_server directive is not get written to krb5.conf. So all I had to do was to put
admin_server = ad.example.local
in that file, and voilà!
$ kpasswd Password for polonkai.gergely@EXAMPLE.LOCAL: Enter new password: Enter it again: Password changed.