Microsoft KB Archive/263156

= SNA Server event IDs 4, 13, and 38 message sequence errors (SENSE 2001) occur =

Article ID: 263156

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft SNA Server 2.11 Service Pack 1
 * Microsoft SNA Server 2.11 Service Pack 2
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 2
 * Microsoft SNA Server 3.0 Service Pack 3
 * Microsoft SNA Server 3.0 Service Pack 4
 * 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
 * Microsoft SNA Server 4.0 Service Pack 4
 * Microsoft Host Integration Server 2000 Standard Edition
 * Microsoft Host Integration Server 2000 Service Pack 1

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This article was previously published under Q263156



SYMPTOMS
A computer running SNA Server that has the Data Link Control (DLC) bound to teamed IBM Netfinity 10/100 Ethernet adapters to communicate with the host may experience dropped LU-LU sessions. The following events may appear in the Application event log.

Event Source: SNA Server

Event ID: 4

Description:

(1133) Message Sequence Error

Event Source: SNA Server

Event ID: 13

Description:

(1141) Message Sequence Error (SENSE = 0)

Event Source: SNA Server

Event ID: 38

Description:

APPC session deactivated abnormally



CAUSE
A packet arrives at the SNA Server link service that is corrupt, causing a sequence number to be skipped. Because the next packet that arrives has a sequence number that is not one greater than the previous, SNA Server sends an UNBIND to the host with sense code 2001, which means there is a sequence error.



RESOLUTION
The teaming function for the adapters that are bound to the DLC must be configured for Fault Tolerance mode, rather than Fast Ether Channel.



WORKAROUND
Disable teaming for the DLC, and use a single NIC for the SNA Server-to-host link.



MORE INFORMATION
An SNA Server trace of this problem contains the following messages (data is truncated for simplicity). The sequence numbers, noted by ^^^^ in each RU, are 009B, 009C, and 009E:

--- 11:41:17.0878 04160000->01020101 DLC DATA DAF:01 OAF:02 ODAI:off Normal RQE FMD MC DR1

Header at address 012054F4, 2 elements 0B050000 00002C00 0102009B 01009000    <......,.........> ^^^^ Element at address 01BF7460, start 10, end 268 009000F0 A140F0F0 F0F0F0F0 F0F0F04B    <...0.@000000000K> F0F0A140 F0F0F0F0 F0F0F0F0 F04BF0F0    <00.@000000000K00> --- 11:41:17.0878 04160000->01020101 DLC DATA DAF:01 OAF:02 ODAI:off Normal RQE FMD MC DR1

Header at address 012049FC, 2 elements 0B050000 00002C00 0102009C 01009000    <......,.........> ^^^^ Element at address 01BF6468, start 10, end 268 009000F0 F0F0F0F0 F04BF0F0 A140F0F0    <...000000K00.@00> F0F0F0F0 F0F0F04B F0F0A140 F0F0F0F0    <0000000K00.@0000> --- 11:41:17.0894 04160000->01020101 DLC DATA DAF:01 OAF:02 ODAI:off Normal RQE FMD MC DR1

Header at address 012043B0, 2 elements 1E040000 00002C00 0102009E 01009000    <......,.........> ^^^^ Element at address 01BF7460, start 10, end 268 009000F0 F0A14F40 A1404040 4040A140    <...00.O@.@@@@@.@> F0F0F0F0 F0F0F0F0 F04BF0F0 A140F0F0    <000000000K00.@00>

The following message appears in the trace where the RU with sequence number 009D needs to be:

--- 11:41:17.0894 04160000->01020101 DLC DATA INVALID TH !!

Header at address 012054F4, 1 elements 1E040000 00000000 00000000 01009000    <................>

Element at address 01BF3EC4, start 10, end 45 00000000 00000000 00000000 00000000    <................> 00000000 00000000 00000000 00000000     <................>

A network trace captured on an independent computer displayed a good RU with sequence 009D arriving at the Ethernet switch to which SNA Server was connected.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbprb KB263156

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