Microsoft KB Archive/149819

= RPC Causes Exchange Server to Hang All Connected Clients =

Article ID: 149819

Article Last Modified on 10/31/2003

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APPLIES TO


 * Microsoft Windows NT 3.51 Service Pack 5
 * Microsoft Exchange Server 4.0 Standard Edition

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This article was previously published under Q149819





SYMPTOMS
All Microsoft Exchange clients connected to a Microsoft Exchange server periodically hang for several minutes. If the clients are left alone, then they will all resume normal operation without loss of data.

This symptom occurs sporadically.



CAUSE
The Microsoft Exchange server received only part of the Remote Procedure Call (RPC) data sent by a Microsoft Exchange client and is waiting for the remaining part.

If a busy Microsoft Exchange server receives RPC data from a Microsoft Exchange client, and it accepts a part of the RPC fragment but not the entire amount, then if the client is rebooted or powered off before the remainder of the fragment is sent, the server can stop processing all RPC requests until the network transport detects the client failure and terminates the connection. If you use a "patient" transport protocol such as TCP/IP, this may take up to five minutes.



RESOLUTION
To resolve this problem on Exchange Servers running on Windows NT 3.51 Server, obtain the fix mentioned below, install Windows NT service pack 5 for NT 3.51 or upgrade to Windows NT Server version 4.0.



STATUS
This problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base:

SERVPACK

Additional query words: prodnt 3.51 exchng

Keywords: KB149819

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