XCON: Remote MTA Reports Syntax Error

 Last reviewed: April 21, 1997
Article ID: Q140937

The information in this article applies to:
  • Microsoft Exchange Server, version 4.0

SYMPTOMS

When you connect to a remote Message Transfer Agent (MTA) via X.400 1988 conformance, the remote MTA may report a [syntax] error when it receives a P1 PDU sent from the Microsoft Exchange Server.

CAUSE

The element that causes the problem is the per-recipient-indicators inside the PerRecipientMessageTransferField. The Microsoft Exchange Server encodes it as an implicit BITSTRING with three unused bits in the last octet. The Recommendation X.411 Figure 4/X.411 defines that the three bits in the last octet are reserved and have the value zero.

Microsoft Exchange Server marks them as "unused," violating the size constraints.

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 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:
Keywords : kbbug4.00 kbfix4.00.sp2 kbusage XCON
Version : 4.0
Platform : WINDOWS

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Last reviewed: April 21, 1997
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