Can you execute an nslookup command against each server? In case you’re unfamiliar with this, open a command prompt and perform the following: nslookup “DNS1 IP Address” “query hostname” nslookup “DNS2 IP Address” “query hostname” Cordially yours, Jerry G. Young II Applications Engineer, Platform Engineering Enterprise Hosting NTT America, an NTT Communications Company 22451 Shaw Rd. Sterling, VA 20166 Office: 571-434-1319 Fax: 703-333-6749 Email: g.young@xxxxxxxx ________________________________ From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Andy Haigh Sent: Tuesday, October 17, 2006 11:55 AM To: isalist@xxxxxxxxxxxxx Subject: [isalist] Re: AD Setup Yes ________________________________ From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Gerald G. Young Sent: Tuesday, 17 October 2006 8:25 PM To: isalist@xxxxxxxxxxxxx Subject: RE: [isalist] AD Setup Are the IP addresses for both DCs entered as DNS servers on the ISA server? Jerry ________________________________ From: isalist-bounce@xxxxxxxxxxxxx 代理 Andy Haigh Sent: 2006/10/16 (月) 20:58 To: isalist@xxxxxxxxxxxxx Subject: [isalist] AD Setup Hi, I have a ISA 2004 SP2 installed in an environment with two DC's installed in it and have configure the firewall to use AD authentication. The problem I am getting is that when I re-boot one of the domain controllers we are no longer able to get out to the internet, the firewall requests a username and password, with the other DC being available I don't understand why this is happening. Any ideas, have I missed something in my setup? Thanks Andy