Knowledge Base

XCON: Microsoft Exchange will not Allow Incoming X.25 Connection

Article ID: 157966

Article Last Modified on 10/28/2006

Microsoft Exchange Server 4.0 Standard Edition

This article was previously published under Q157966

SYMPTOMS

When the Microsoft Exchange Message Transfer Agent (MTA) receives an inbound X.25 connection, it mail refuse the connection due to an incorrect X.121 address even though the addresses match on both sides.

CAUSE

Microsoft Exchange Server version 4.0 improperly overwrites the inbound X.121 address field with the Incoming Facilities Data field and this causes the X.121 addresses not to match when a session attempt is made.

RESOLUTION

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 version 4.0 of Microsoft Exchange. This problem was corrected in the latest Microsoft Exchange 4.0 Server U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: sp3 x25 eicon mci att

Keywords: KB157966