With the firewall enabled it causes network problems, latencies up to 1000ms constant, dns and active directory problems. When it is turned off it does not happen.
This can be caused by packet logging being enabled on Firewall Rules.
Check all firewall rules. Change any rule where logging is set to Packet Logging. Logging can be set to None or Traffic only, as needed. Packet logging should only be used when troubleshooting firewall problems.