Feb 8 15:38:09 vpn-gw-ausfall openvpn[9031]: pam_krb5(openvpn-krb5:auth): (user hildeb) credential verification failed: KDC has no support for encryption type
is an error message from the underlying Kerberos library that libpam-krb5 can't do anything about. libpam-krb5 itself doesn't know (or care) anything about enctypes.
Reassigning to krb5, as:
Feb 8 15:38:09 vpn-gw-ausfall openvpn[9031]: pam_krb5( openvpn- krb5:auth) : (user hildeb) credential verification failed: KDC has no support for encryption type
is an error message from the underlying Kerberos library that libpam-krb5 can't do anything about. libpam-krb5 itself doesn't know (or care) anything about enctypes.