Microsoft KB Archive/149453

= Qualifier 11 Using DFT Link Service =

Article ID: 149453

Article Last Modified on 11/26/2003

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APPLIES TO


 * Microsoft SNA Server 2.0, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 2.1, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 3.0, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 2.11 Service Pack 1, when used with:
 * Microsoft Windows NT 4.0

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This article was previously published under Q149453





SYMPTOMS
The SNA Server may send a Request/Response Unit (RU) to the DFT adapter that is larger than the total buffer size on the adapter, which causes the DFT connection to disconnect. The SNA Server logs an Event ID 23 with a Qualifier of 0x11 (DSR failure) when this problem occurs.

NOTE: 137804 details another cause of an Event ID 23 with a Qualifier of 0x11 when you use a DFT Link Service on SNA Server.



CAUSE
In order to prevent SNA Server from trying to send a message larger than the DFT card can handle (about 970 bytes), the DFT link service needs to modify the Maximum RU size field in a BIND received from the host to reflect the actual RU size that it can receive before it passes the BIND request up to the SNA Server.



RESOLUTION
The Ibmdft.dll driver has been updated to modify the Maximum RU Size field of the BIND request before it passes it on to the SNA Server.



STATUS
Microsoft has confirmed this to be a problem in Microsoft SNA Server versions 2.1, 2.11, and 2.11.sp1. This problem was corrected in the latest Microsoft SNA Server 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

Additional query words: prodsna coax 3174

Keywords: kbbug kbfix kbnetwork KB149453

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