Knowledge Base

XCON: Exchange Fails to Allow an Incoming X.25 Connection

Article ID: 157698

Article Last Modified on 10/28/2006

Microsoft Exchange Server 4.0 Service Pack 1
Microsoft Exchange Server 4.0 Service Pack 2

This article was previously published under Q157698

SYMPTOMS

The Microsoft Exchange Message Transfer Agent (MTA) might fail to receive an inbound X.25 connection due to an incorrect X.121 address. This can occur even though the X.121 addresses match on both sides of the connection.

CAUSE

The MTA improperly overwrites the inbound X.121 Address field with the incoming Facilities Data field. This causes the X.121 addresses not to match when a session attempt is made. Thus, the X.25 listen will fail if Facilities Data is configured inbound.

MORE INFORMATION

If the Facilities Call Data field does not have to be used, the field can be left blank and the inbound X.121 address will be unaffected.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 4.0. This problem was corrected in the latest Microsoft Exchange Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base:

SERVPACK

Additional query words: sp3 x25 eicon mci att

Keywords: kbusage KB157698