Unfortunately, as indicated in my previous email, if Exchange 2003 is running on a DC/GC, it will use the AD services available on itself exclusively. If the AD services go down on itself it will not fail over to another DC/GC. Exchange should not be installed on a DC. Exchange should not be installed on a DC/GC. If you must install Exchange on these, it will not fail over. --billw -----Original Message----- From: Chad Roush [mailto:croush@xxxxxxxxxxx] Sent: Thursday, October 02, 2003 1:54 PM To: [ExchangeList] Subject: [exchangelist] Question concerning Exchange 2003 and the Global Catalog http://www.MSExchange.org/ I would like some advice, I am wrapping up my Exchange 5.5 to Exchange 2003 upgrade at this time. Here is my current configuration Server1 - W2K DC running DNS, DHCP, Wins currently the operations master server GC, PDC emulator, etc. Server2 - W2K DC running DNS, WINS, Exchange 2003 Server3 - W2K server running ISA server While moving my mailboxes we had a problem with Server1 and were down for a few hours waiting for parts to arrive. Since server1 was running the global catalog the users who were moved to the Exchange 2003 server were unable to access the new Exchange server. Now that we have repaired server1 I want to make sure that one server being down does not shut down access to the other servers. To help resolve the Global Catalog issue, I have enabled the global catalog on server2 also. Now in theory if server1 is down, my Exchange clients should be able to fail over to the second GC. Am I thinking correctly? Any other suggestions to help make these systems more fault tollerent? Thanks, Chad ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: billw@xxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')