HI, I have a problem publishing my OWA through ISA server. There is no problem using OWA within the internal network. But when i try to access the OWA using http://<ISA external IP>/exchange it gives the error BAD GATEWAY A DNS lookup error occurred. I used the Publish Outlool Web Access server wizard available with ISA Featured Pack 1. we already have our MX record registered pointing to the external interface IP of the ISA server. i can access the my mail server using POP3 and IMAP clients from outside i tried to telnet the external interface of our ISA server using port 80 it was successful. i dont know what the problem is. i think there is some DNS issue. I Hope anyone can help me solve this problem. thanks IKM