Microsoft KB Archive/323733

= XCON: Two Servers in the Same Site Cannot Exchange E-Mail =

Article ID: 323733

Article Last Modified on 10/1/2003

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q323733



SYMPTOMS
You may notice that two servers running Exchange Server 5.5 in the same site cannot exchange e-mail. E-mail is queuing to be sent to the other server but the e-mail is not sent. These servers have successfully exchanged e-mail in the past, and no other Exchange Server computer in your site has problems sending e-mail or receiving e-mail.

One of the servers is running Microsoft Windows NT Server 4.0, Service Pack 6 and the other is running Microsoft Windows 2000 Server, Service Pack 2.

If you test for network connectivity between the two servers using utilities such as RPC Ping, Ping, and Net Use, all tests are successful.

You may also find the following events listed in the Application log of the Event Viewer:

Event ID: 9322

Source: MSExchangeMTA Type: Warning

Description: An interface error has occurred. An MtaBindBack over RPC has failed. Locality Table (LTAB) index: 68, NT/MTA error code: 5. Comms error 5, Bind error 0, Remote Server Name OTHERSERVER, Protocol String ncacn_ip_tcp:your server IP address[3208] [BASE IL INCOMING RPC 39 507] (14)

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Event ID: 9318

Source: MSExchangeMTA

Type: Warning

Description: An RPC communications error occurred. Unable to bind over RPC. Locality Table (LTAB) index: 70, NT/MTA error code: 5. Comms error 5, Bind error 0, Remote Server Name OTHERSERVER [MAIN BASE 1 500 %10] (14)



CAUSE
This issue may be caused by mismatched dynamic-link libraries (DLLs) between the Windows 2000 and Windows NT servers. If you install the Microsoft Windows 2000 Security Rollup Package on the Windows 2000 server, this may install the following mismatched dynamic-link libraries (DLLs):

Schannel.dll

Ntlmssps.dll

This will cause the Windows NT 4.0-based server to negotiate a 128-bit connection. However, the 56-bit Windows NT security DLLs cannot decrypt the packets. The Windows 2000 Security Rollup Package forces NTLM version 2 connections with the Windows NT 4.0-based server.



RESOLUTION
To resolve this issue, see the resolution and workaround information in the following Microsoft Knowledge Base article:

322051 Programs May Not Connect to Server with Mismatched Security DLLs in Windows NT 4.0



MORE INFORMATION
For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

311401 Windows 2000 Security Rollup Package 1 (SRP1), January 2002

272218 XCLN: RPC Ping Utility and Exchange 2000 Server

323388 HOW TO: Diagnose and Test TCP/IP or NetBIOS Network Connections in Windows Server 2003

177446 How to Test Microsoft Remote Procedure Call Performance

323733 XCON: Two Servers in the Same Site Cannot Exchange E-Mail

Keywords: kberrmsg kbprb KB323733

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