@typo3usa.com:
We then setup the WAN to allow
TCP: 20,21,22,25,53,80,110,125,143,443,465,953,993,995,2077,2078,2082,2083,2086,2087,2095,2096,3306,55555,55553
UDP: 20,21,53,113,123,873,953,6277,33434:33523
Both TCP and UDP for port 53 are allowed - however clients internally are unable to resolve dns requests. (all but one)
What DNS servers are assigned to the clients?
The ports open on the WAN tab are for incoming traffic on the WAN interface only. Users requesting DNS resolution use your "allow all" rule on the LAN tab.