EHNAPPC Data Stream Header Data Being Passed to TP (140816)


The information in this article applies to:

  • Microsoft SNA Server 2.0, when used with:
    • the operating system: Microsoft Windows NT
  • Microsoft SNA Server 2.1, when used with:
    • the operating system: Microsoft Windows NT
  • Microsoft SNA Server 2.11, when used with:
    • the operating system: Microsoft Windows NT
This article was previously published under Q140816

SYMPTOMS

When using mapped APPC conversations with the Enhanced Router API (EHNAPPC.DLL), transaction programs (TPs) receive the extra data even though they should not.

CAUSE

When sending data, the SNA Server EHNAPPC.DLL is passing the extra 4-byte Basic APPC conversation header into the APPC data stream when using a MAPPED conversation. However, it should ignore the 4-byte header. The header consists of:
  • 2 bytes that are reserved for LL field designation.
  • 2 bytes for the length of the data field.

RESOLUTION

Microsoft modified the EHNAPPC.DLL file so that it only passed up the data to the transaction program, not the 4-byte header.

STATUS

Microsoft has confirmed this to be a problem in SNA Server for Windows NT. This problem was corrected in the latest SNA Server for Windows NT, 2.11 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

Modification Type:MajorLast Reviewed:12/8/2003
Keywords:kbbug kbfix KB140816
©2003 Microsoft Corporation. All rights reserved.