David, I hit the issue in this branch: https://git.samba.org/?p=asn/samba.git;a=shortlog;h=refs/heads/master-mit-kdc You need to install the MIT Kerberos Server and build Samba with ./confiugre --with-mitkrb5 Then you need to revert the patch: "TEMP WORKAROUND: Disable MIT KRB5 replay cache." make make test I don't remember which test it was which revealed the problem. I don't have time to look into this right now.