Thank u Dr. Tom
I have a server with isa server 2000 installed on domain: local.net (same machine)
how this problem of DNS done fix?
IP ext : 193.194.74.241
IP intn :192.168.0.1
Client : SNat : IP 192.168.0.11 , Mask: 255.255.255.0 GW : 192.168.0.1