Welcome to the forums. Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your topics and posts, as well as connect with other members through your own private inbox!
The firewall rules you need to configure in order to allow domain joining are the following:
Server LAN to Client LAN – Only allow Ping Traffics (ICMP Type 8, Code:255)
Client LAN to Server LAN – Only allow:
TCP : 88, 135, 139, 389, 445, 49152-65535 (High Ports)
UDP : 53, 123, 137, 138, 389, 123, 49152-65536 (High Ports)