Messages not Being Delivered Over an Association

ID: Q181721

The information in this article applies to:


The Microsoft Exchange message transfer agent (MTA) has a backlog of messages (up to the default threshold) waiting to be delivered. The MTA makes an association with another LAN-MTA (RPC connection), but does not deliver mail over this connection.

Various errors may appear in the applications event log concerning RPC problems. These may include the following events and other similar errors that 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. The MTA 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:[1911] BASE IL] (14)


The Windows NT RPC component on the receiving computer puts the association in the wrong address space. Therefore, when the next bind arrives on the correct 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, please see the following article in the Microsoft Knowledge Base:

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


Microsoft has confirmed this to be 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.

Additional query words: 4.00 5.00 5.50 RT-Turn-Please RT-Turn-Give ASB token give XADM

Keywords          : NT4SP4Fix kbbug4.00 kbfix4.00 
Version           : winnt:4.0,5.0,5.5
Platform          : winnt 
Issue type        : kbbug 

Last Reviewed: April 10, 1999