Chris, Is the Exchange server and the DC on the internal network? What does your DNS config look like on the Exchange server? It's preferred DNS server should be the IP of the DC. Jason -----Original Message----- From: Chris Lawless [mailto:ChrisL@xxxxxxxxxxxxxxxxxx] Sent: Tuesday, May 14, 2002 12:06 AM To: [ISAserver.org Discussion List] Subject: [isalist] ISA Blocking AD? http://www.ISAserver.org Is it possible ISA could block communication when trying to located the domain? I have a test network, an ISA, a Domain Controller and an Exchange Server. The Exchange server cannot find the domain. Both are configured as SNat clients, they can both see and ping each other but the Exchange server cannot access Active Directory. Am I on the wrong tack looking to ISA? Seems I can never find my domain controller these days, ho hum. Chris. ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jasonb54@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')