John,

Have you looked at Q304403 (may or may not help you)? Are there any
other errors? DNS is working, right? DNS shows the correct resource
records for the new DC right? Have you tried using nltest? If so, did
you receive any errors? Have you done a netmon trace of the startup / GC
discovery process? 

Tom.

-----Original Message-----
From: John Maunderr [mailto:[EMAIL PROTECTED]] 
Sent: Sunday, November 25, 2001 9:23 PM
To: Exchange Discussions
Subject: Global Catalog Problem

Hi,

I am running all of my servers on Win2KSP2.

I have set up a second Domain Controller (on a different subnet) to
provide redundancy for my Primary DC, but especially to keep Ex2KSP1
operable. I have also marked this DC to be a Catalog Server.

However, when I disconnect my original DC from the network, & then
attempt
to open Outlook on a client, access to the Outlook mailbox is
unavailable.
Exchange logs the following error;

"Event Type: Error
Event Source: MSExchangeSA
Event Category: NSPI Proxy 
Event ID: 9057
Date: 22/11/2001
Time: 8:52:48 AM
User: N/A
Computer: SNAP
Description:
NSPI Proxy cannot contact any Global Catalog that supports the NSPI
Service. New clients will be refused until a Global Catalog is
available. After a Domain Controller is promoted to a Global Catalog, it
must be rebooted to support MAPI Clients. "

I have rebooted the DC several times.

Can someone advise me what I am doing wrongly & how I can enable the
'backup' DC to fufill Ex2K's requirements so that clients can use
Outlook?

John

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