On 24/09/2020 14:57, L.P.H. van Belle wrote: > Kerberos does that fine with ip only you must have a PTR record to the hostname. ;-) > And this only works if people didnt set rdns=no in krb5.conf > Kerberos does not work with ipaddresses, when did you last see an ipaddress in a keytab, UPN or SPN ?? Rowland