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Q243398: XADM: Two Sites With the Same Org and Site Name May Join

Article: Q243398
Product(s): Microsoft Exchange
Version(s): winnt:4.0,5.0,5.5
Operating System(s): 
Keyword(s): exc4 exc5 exc55
Last Modified: 25-NOV-1999

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The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SUMMARY
=======

When you have two multi-server sites with the same organization and site name
and same service account, and you remove a server from one site and install it
in the other site without deleting the server from the original site, the two
sites will join together.

When this happens, you receive the following message on the server left in the
original site:

  Event ID: 1349
  Source: MSExchangeDS
  Type: Warning
  Description:
  The GUID on server ServerD has changed from 8ab25beb042fd311af6c00c04f68de18
  ServerD to 54242885302fd311af6e00c04f68de18. This will cause all replicas to
  be resynced from scratch.

MORE INFORMATION
================

This behavior is by design.

When Exchange Server is removed from a server, you must delete it from the site
so that all servers are notified that it was removed. The Remove All option in
Setup does not do this. If the server is not removed, the remaining servers know
the departed computer by name and will establish remote procedure call (RPC)
connections to it as needed. Because they are in the same security context,
there is no problem establishing a connection. Two sites with the same
organization and site name have the same Naming Context (NC), so the information
returned on a replication request is valid for the NC. When the two servers
communicate, the remaining server sees that the GUID has changed on the moved
computer. This cannot be used to decide against replication, however, because a
server that is removed and reinstalled in the same site will also have a new
GUID. There is no GUID for the organization itself, so Exchange Server cannot
determine that an organization change has occurred.

Additional query words:

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Keywords          : exc4 exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbinfo

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