When you remove the GC from the network the usual issue is that one of them will be the Config DC. Undoubtably it's the one you remove. After removing the GC you can run DCSFlush which will force Exchange to go and find a new Config DC. DSADiag 2 from the command prompt should go and find a list of the GC's and DC's available and set one of them as the Config DC. Alternatively the Config DC and the list of GC's and DC's can be hardcoded via the registry. [HKEY_LOCAL_MACHINE\system\currentcontrolset\services\MSExchangeDSAccess \Instance0] "ConfigDCHostName" = "configdc.microsoft.com" [HKEY_LOCAL_MACHINE\system\currentcontrolset\services\MSExchangeDSAccess \Profiles\Default\UserDC1] "IsGC" = dword:00 "HostName" = "firstDC.microsoft.com" [HKEY_LOCAL_MACHINE\system\currentcontrolset\services\MSExchangeDSAccess \Profiles\Default\UserDC2] "IsGC" = dword:00 "HostName" = "secondDC.microsoft.com" [HKEY_LOCAL_MACHINE\system\currentcontrolset\services\MSExchangeDSAccess \Profiles\Default\UserDC3] "IsGC" = dword:00 "HostName" = "thirdDC.microsoft.com" Normally the process of rediscovering a Config DC is done automatically under E2K. This should be done within 20 minutes, but if the users are using MAPI clients they will need to relogin. OWA users should get functionality back to their mailbox dynamically. Hope this helps. Mark Shevill IMG Messaging Technical Lead Shell Information Technology International Limited Rowlandsway, Wythenshawe, Manchester M22 5SB, United Kingdom Tel: +44 161 435 8709 Fax: +44 161 933 3502 Other Tel: +44 7932 625510 Email: Mark.Shevill@xxxxxxxxx Internet: http://www.shell.com -----Original Message----- From: sub@xxxxxxxxxxxxxxx [mailto:sub@xxxxxxxxxxxxxxx] Sent: 06 October 2003 22:38 To: [ExchangeList] http://www.MSExchange.org/ I have one Exchange 2000 server installed as a member server, and two Domain Controllers (DC1 & DC2) within my domain. Both DC's are assigned Global Catalog server. I need to remove DC1 from our network, but when DC1 is offline, no one is able to access Exchange. Having multiple GC's should allow me to (temporarily or permanently) remove either DC, correct? Am I missing a step? ------------------------------------------------------ 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: Mark.Shevill@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')