Microsoft KB Archive/150628

= Event 3 May Indicate Excessive APPC LU Partnerships =

Article ID: 150628

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 Q150628



SYMPTOMS
If you define too many LU-LU partnerships, SNA Server will run out of Internal Mode Control Blocks. You may get the following Dr. Watson error message in SNA Server:

80000003 (hardcoded breakpoint).

In addition, the following Event 3 will be logged in the Application Event log:

  Event ID: 3 (1102) Node Configuration Error EXPLANATION: The SNA server (node) detected a configuration file problem caused by a  logic error in the configuration program. These subcodes should not occur during normal operation.



CAUSE
Each LU-LU partnership requires one Internal Mode Control Block (IMCB), and an additional IMCB is reserved if the LU is defined for parallel sessions. The limit is 4096 Internal Mode Control Blocks per SNA Server.

For example, a configuration with 240 connections (each with 1 LU defined) and a node with 10 local LUs (each partnered with every remote LU) will result in the use of 2400 Mode control blocks. In addition, if the LUs support parallel sessions, each is implicitly partnered with the SNASVCMG mode for CNOS, taking up another 2400 control blocks, for a total of 4800 control blocks. Therefore, the node reports the error and terminates.



WORKAROUND
Reduce the number of LOCAL LUs configured. Each local LU that is removed saves 2*partner LU Mode control blocks.

Additional query words: 2.00 2.11 2.11.sp1

Keywords: kbprb KB150628

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