XCON: How to Configure TURN Client for Exchange Server 5.5 (257979)


The information in this article applies to:

  • Microsoft Exchange Server 5.5
This article was previously published under Q257979
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 5.5 can automatically dequeue e-mail messages from a provider's server. This option is used in environments where the Exchange Server computer does not have a continuous connection to the Internet, and a provider "hosts" the domain the Exchange Server computer uses. Typically, Exchange Server 5.5 issues the ETRN command to the server to initiate this transfer.

MORE INFORMATION

Some providers do not support ETRN or cannot provide a static Internet Protocol (IP) address for hosted customers, and instead support the issuing of the TURN or ATRN command. You can configure Exchange Server 5.5 to issue this command sequence rather than ETRN if necessary. This option is also useful when a proxy server, Routing and Remote Access Service (RRAS) server, or a demand-dial router performs the dial-up connection to the Internet and is assigned a dynamic IP address. The TURN client functionality enables servers that receive a dynamic IP address assignment from an Internet service provider (ISP) to retrieve e-mail messages from an Internet-based e-mail server that queues e-mail messages for TURN.

To configure the Exchange Server computer to issue the TURN command rather than the ETRN command sequence, use the following steps.

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.
  1. Start Registry Editor.
  2. Locate the following registry key:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Service\MSExchangeIMC\Parameters

  3. Add a DWORD value named AlwaysUseTURN, and then set the value to 0x1.
  4. Using the Exchange Administrator program, go to Internet Mail Service in the Connections Container, and then double-click the object to view its properties.
  5. On the Security tab, click the Edit button for the domain.
  6. Click SASL/SSL security.
  7. Click SASL/AUTH, and then click Change.
  8. Type the authorization credentials (user name and password) necessary to log on to the remote computer.

    NOTE: If you are connecting to a Microsoft Windows domain, be sure to include the domain (for example, domain\user_account).
  9. Stop and restart Internet Mail Service for the changes to take effect.
You can use the following sample script with the Windows Script Host that will make the registry change. 
L_Welcome_MsgBox_Message_Text   = "This script adds the AlwaysUseTURN value to the Internet Mail Service that enables LAN based TURN."
L_Welcome_MsgBox_Title_Text     = "Enabling TURN"
Call Welcome()

Dim WSHShell
Set WSHShell = WScript.CreateObject("WScript.Shell")
WSHShell.Popup "Set value  HKLM\System\CurrentControlSet\Services\MSExchangeIMC\Parameters\AlwaysUseTURN to  REG_DWORD 1"
WSHShell.RegWrite  "HKLM\System\CurrentControlSet\Services\MSExchangeIMC\Parameters\AlwaysUseTURN" , 1,  "REG_DWORD"

Sub Welcome()
    Dim intDoIt

    intDoIt =  MsgBox(L_Welcome_MsgBox_Message_Text,    _   
                      vbOKCancel + vbInformation,       _
                      L_Welcome_MsgBox_Title_Text )
    If intDoIt = vbCancel Then
        WScript.Quit
    End If
End Sub
Modification Type:MinorLast Reviewed:4/28/2005
Keywords:kbenv kbinfo kbsetup KB257979
©2004 Microsoft Corporation. All rights reserved.