I have External DNS for our Domains hosted in the ISA Server's Machine. Since Yesturday I get Email errors attached below: I have about 100 Domains in the DNs wwith the Primary being offsite and the secondary being on the ISA server at our Office (we have 2 INTERNAL DNS Servers for AD) Server publishing rule [dns query] that maps 192.168.0.1:53 UDP to 203.xxx.xxx.xxx:53 for protocol [DNS Query Server] failed because the port on the external interface is being used by another application. The Firewall service failed to bind socket for the server on the firewall since another process is using the same port. Check for any other process using the same port and terminate if necessary. SECOND MESSAGE Server publishing rule [dns zone transfer] that maps 192.168.0.1:53 TCP to 203.xxx.xxx.xxx:53 for protocol [DNS Zone Transfer Server] failed because the port on the external interface is being used by another application. The Firewall service failed to bind socket for the server on the firewall since another process is using the same port. Check for any other process using the same port and terminate if necessary