Microsoft KB Archive/189494

= XCON: MTA 9277 RPC Cancel Call for Thread =

Article ID: 189494

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q189494



SYMPTOMS
A large number (up to hundreds) of Event IDs: 9277 appear in the application event log, similar to the following:   9277: MSExchangeMTA The MTA has issued an RPC Cancel call for thread 22, Locality Table Index: 142, Time (ms): 1804070, Cancel result: 0 [TRUMAN RPC inactive ncacn_ip_tcp:192.168.20.3[1966] BASE IL] (14)



CAUSE
The message transfer agent (MTA) makes remote procedure calls (RPCs) to other MTAs in the normal course of operation. When the MTA has made a call to another computer and does not receive a response within two minutes, it cancels the RPC. This is normal. A massive number of these RPC cancels indicates any of several possible problems, such as the following:


 * network problems
 * heavy network traffic
 * network latency issues (not uncommon with frame relay networks with guaranty bandwidths of less than 128 kilobits per second)
 * problems with the remote computer
 * router problems (or router changes, including filtering or other software running on the routers that analyzes and filters or alters network packets)
 * protocol stack problems



WORKAROUND
To work around this problem, verify basic connectivity between the Exchange Server computers, or fix the network issues.

Keywords: kbprb KB189494

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