Microsoft KB Archive/262473

= LU 6.2 Data Compression Fails When Initiated by Host System =

Article ID: 262473

Article Last Modified on 11/24/2003

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APPLIES TO


 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 4.0 Service Pack 1
 * Microsoft SNA Server 4.0 Service Pack 2
 * Microsoft SNA Server 4.0 Service Pack 3

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This article was previously published under Q262473



SYMPTOMS
SNA Server does not use LU 6.2 data compression when the BIND is a host initiated, non-extended BIND. Compression is not used even though it has been configured on both the connection and on the APPC mode definition.



CAUSE
When SNA Server negotiates LU 6.2 compression, it checks the level of compression that is configured on the mode entry and the level of compression that is configured on the connection. It obtains this information from a connection record in an internal connection table.

This problem occurs because SNA Server is incorrectly reading the connection record, and therefore, it obtains the wrong value for compression support. Because of this, SNA Server does not accept the host systems request for data compression.



RESOLUTION
To resolve this problem, obtain the latest service pack for SNA Server 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack



WORKAROUND
This problem does not occur when SNA Server initiates the BIND with the host. In most scenarios, setting an Automatic Activation Limit on the APPC mode definition eliminates this problem by forcing SNA Server to initiate the BIND with the host.



STATUS
Microsoft has confirmed that this is a problem in Microsoft SNA Server version 4.0, 4.0 SP1, 4.0 SP2, and 4.0 SP3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.



MORE INFORMATION
For LU 6.2 data compression to work on SNA Server, it needs to be configured on both the connection and the APPC mode definition. This is also true for 3270/LUA LU data compression, which needs to be configured on both the connection and the LU.

For additional information on how to configure SNA Server for compression when non-extended BINDs are used, click the article number below to view the article in the Microsoft Knowledge Base:

266091 Configuring For Host Compression When Using Non-Extended BINDs

Keywords: kbbug kbfix kbsna400presp4fix kbqfe kbsna400sp4fix KB262473

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