This article was previously published under Q181721
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The Microsoft Exchange message transfer agent (MTA) has a backlog ofmessages (up to the default threshold) waiting to be delivered. The MTAmakes an association with another LAN-MTA (RPC connection), but does notdeliver mail over this connection.
Various errors may appear in the applications event log concerning RPCproblems. These may include the following events and other similar errorsthat indicate RPC problems:
Event id = 9316 Category = Interface Source = MSExchangeMTA An RPC communications error occurred. No data was sent over the RPC connection. Locality table (LTAB) index: 53. Windows NT error: 1727. TheMTA will attempt to recover the RPC connection. [BASE IL KERNEL 24 512](12)
Event id = 9277 Category = Interface Source = MSExchangeMTA The MTA has issued an RPC Cancel call for thread 1, Locality Table Index: 160, Time (ms): 1275740, Cancel result: 0 [SLPS100 MtaBind ncacn_ip_tcp:22.214.171.124 BASE IL] (14)
The Windows NT RPC component on the receiving computer puts the associationin the wrong address space. Therefore, when the next bind arrives on thecorrect address, it cannot find the association and sends a Bind NAK.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
The initiating MTA tries to send mail to the receiving MTA, but the receiving MTA does not believe it has an association with it because the RPC put the association in the wrong address. It will NAK the RPC Bind request.
After the message threshold has been reached (default value is 50) on one of the MTAs, it will make a new association and begin delivering messages again.
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