Microsoft KB Archive/258292

= XIMS: How to Disable Support for ETRN =

Article ID: 258292

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q258292



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SUMMARY
Exchange Server supports the use of a Simple Mail Transfer Protocol (SMTP) extension called ETRN for dial-up connections that use Remote Access Service (RAS). After the client host submits the ETRN command to the server host, a new connection is established from the server host to the client host, and mail to the client host domain is retried immediately.



MORE INFORMATION
You can disable ETRN by modifying the registry:

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Using RegEdit
 Start Regedit.exe. Locate the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIMC\Parameters

 Click Edit, and then click New DWORD Value. Type DisableETRN. Under Value data, type 1 .

Using RegEdt32
 Start Registry Editor (Regedt32.exe).</li> Locate the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIMC\Parameters

</li> On the Edit menu, click Add Value, and then add the following registry value:

Value Name: DisableETRN

Data Type: REG_DWORD

Value: 1

</li> Quit Registry Editor.</li></ol>

For more information about how to use ETRN, see Microsoft Exchange Server Concepts and Planning, and Request for Comments (RFC) 1985, "SMTP Service Extension for Remote Message Queue Starting."

Keywords: kbinfo KB258292

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