Microsoft KB Archive/255991

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Article ID: 255991

Article Last Modified on 10/27/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q255991

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


To properly configure the X.400 connector to send mail via a Routing and Remote Access Server (RRAS) link, you must complete the following steps:

  • Configure the Demand Dial Interfaces using the provided wizard.
  • Create the static route.
  • Decide upon the TCP/IP networks you will use for the RAS pool.
  • Configure the X.400 connector.


Complete the following steps on both servers.

Step One: Configure the Demand Dial Interface (DDI)

  1. Open the Routing and RAS Administrator.
  2. Right-click LAN and Demand Dial Interfaces.
  3. Click Add New Interface. Confirm that Use Demand Dial Wizard check box is selected.
  4. Select a name for the Demand Dial Interfaces (DDI). This will be the same name used for the interface on the other side of the RRAS link.
  5. Click to select the following check boxes on the next dialog box:
    • Route IP Packets on this interface
    • Add a user account so a remote router can dial in
    • Authenticate remote router when dialing out
  6. Enter the phone number for the remote server.
  7. Enter the credentials that this interface will use to authenticate when dialing the remote server. These credentials must match the credentials configured on the remote server.
  8. Set the credentials that the remote server will use to authenticate when it dials this server.

For simplicity's sake, the credentials on both domains should have the same name and password. Also, the user name will be the same as the name used for the DDI.

  1. Click Finish to configure the interface.

Step Two: Create the Static Route

  1. Open the Routing and RRAS Administrator.
  2. Expand IP Routing.
  3. Right-click Static Routes and click Add Static Route.
  4. Enter the following values:
    • Destination: The Network ID for the remote server. For example, if the remote server's NIC IP address is, the Network ID will be
    • Subnet Mask:
    • Gateway:
    • Interface: Select the DDI previously configured.

Step Three: Configure the RAS Pool

  1. Open the Network tool in Control Panel and click the Services tab.
  2. Double-click Routing and Remote Access.
  3. Click Network, and then click the Configure button next to the TCP/IP check box.
  4. Click Use static address pool and type the network ID and subnet mask. A good choice is a network address from the private range. One example would be with a mask of This would give you 5 addresses for clients. For this scenario, only one client address is required. If you require more, just adjust the last octet of the subnet mask. A subnet mask of would provide a pool of 253 client addresses.
  5. Click OK to save your changes and restart the server when prompted.

Step Four: Configure the X.400 Connector

All settings for the X.400 connector are the same when connecting by RRAS instead of by LAN, except for the following:

  1. Use the IP address for the remote server on the Stack tab.
  2. Change the default settings for the following fields on the Override tab of the connector.
    • Checkpoint Size - 15
    • Recovery Timeout - 30
    • Max Open Retries - 7
    • Open Interval - 120
    • Lifetime 15
    • Disconnect 15
  3. When RRAS is installed on a server, it is, in effect, dual-homed. If RRAS
    and Exchange Server are on the same server you must add the following
    registry setting so that the message transfer agent (MTA) specifies which IP address the lower
    layers of the IP Stack are to use as the destination address.

    Without this registry setting, it is possible that the IP address of the WAN-wrapper is what will be used as the destination address. In that case, the X.400 connector on the remote server will compare the IP address it is receiving to the one on its Stack tab. These will not match and the association will fail. You will see an Event ID 9301 in the Application Log of the remote server.

    Your Exchange Server computer must have Service Pack 1 installed to
    configure this setting. Refer to the following Microsoft Knowledge Base article for more information.

    197378 XCON: MTA Generates 9301 Events on Incoming Connections

    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. Find the following registry key:


    3. On the Edit menu, click Add Key, and add the following registry key value, with no entry for class:


      This is the directory name of the X.400 Connector.
    4. On the Edit menu, click Add Value and add the following value under the key just created.

      Name: Stack IP Address Override
      Class: REG_SZ:
      Value: The IP address for the NIC on this server

      The value entered here will match the IP address on the Stack tab of the X.400 connector on the remote server. When that MTA compares the IP address in the packet stream with what is on the Stack tab, it will find a match and an association will be established.

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