X400: Err Msg: ERROR 1 (TRAN): Invalid TPDU 70 in State 4 (123824)


The information in this article applies to:

  • Microsoft Mail Gateway to X.400 3.2x
This article was previously published under Q123824

SYMPTOMS

Version 3.2x of the Microsoft Mail Gateway for X.400 may display the following message in the X400xxxx.LOG file if verbose and debug logging are enabled (-lvd):
Incoming ER TPDU on connection xx:
0970001A 00C10302 F080
ERROR 1 (TRAN): Invalid TPDU 70 in state 4

CAUSE

The data field in the message has a field length of zero. This is allowed if it is the last packet.

RESOLUTION

The remote X400 message transfer agent (MTA) must be able to accept the last packet in the conversation if it has a data field length of zero. Contact the administrator of the other X400 MTA to verify it will accept an end packet of data field length zero.

MORE INFORMATION

A complete explanation of the TPDU follows: 
   rv[ 10] 0970001A 00C10302 F080
 
      09  length       = 9
      70  TPDU type    = ER
      001A             = Destination reference
      00  reject cause = Not specified
      C1 03 02 F080    = The invalid TPDU that the other side is
                         complaining about.
The invalid TPDU: 
      02 length        = 2
      F0 TPDU type     = DT
      80  EOT or the end flag.
The Microsoft X.400 Gateway may create a zero length data field if the length of the message happened to fall on a DT TPDU boundary. This is not a violation of the X.400 standard. According to X.224 section 6.3.3.:

All DT TPDUs except the last DT TPDU in a sequence greater than one shall have a length of data greater than zero.

This is the last DT TPDU in a sequence (the EOT flag being on), so it is allowed to have a zero length user data field.
Modification Type:MajorLast Reviewed:11/10/1999
Keywords:KB123824
©2002 Microsoft Corporation. All rights reserved.