I have opened the following ports in the opensuse 13.1 64 bit firewall TCP 1024 1025:5000 135 139 25 389 42 53 445 464 49152:65535 5722 636 88 9389 UDP 1025:5000 123 137 138 389 445 464 49152:65535 53 67 88 But when I try to join a windows 7 pc to the domain I get an error If I use the for example sienic instead of sienic.site which is my domain name I get a DNS error An Active Directory Domain Controller (AD DC) for the domain "sienic" could not be contacted. Ensure the domain name is typed correctly. If the name is correct, click Details for troubleshooting information. And cannot connect at all If I use the complete domain name sienic.site, it joins to the domain but there is an error Changing the Primary Domain DNS name of this computer to "" failed. The name will remain "sienic.site". If I disable the firewall I get no error in any of both cases What port I am missing here? thanks