JR28884: PCOM: XIDS FLOOD THE NETWORK WHEN DUPLICATE CP NAME USED

Communications Server for Windows, Version 6.1.3 -- Latest Fixpack

APAR status

• Closed as program error.

Error description

• Using CS613 EEDLC configuration with a duplicate CP name
  the host is assigning the TG number and the link activates
  successfully with a different TG number than the one with active
  CP-CP sessions.  Then when the node attempts to activate another
  ( because the other node with a duplicate CP name already has
  CP-CP sessions )  CP-CP session, the host sends a DISC RQ and
  CS613 responds DISC RSP(DM).  Since the link is auto activate,
  CS613 immediately retries activation of the link (no delay) that
  was disconnected.  There is no delay since it was not an
  activation failure.
  
  There needs to be a configurable option in the ACG to control
  the frequency of reactivation attempts.
  

Local fix

• Use a unique CP name in the PCOM ACG
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users who have erroneously configured their  *
  *                 network to have two machines with the same   *
  *                 CP name.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Continuous retries to establish links   *
  *                      occur when two machines have the same   *
  *                      CP name.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The remote end was allowing the link to activate, then
  immediately disconnecting it.  We therefore instantly retried
  the failing link, causing a loop of retries.
  

Problem conclusion

• APPN.SYS code was changed to treat a link that fails shortly
  after starting as a "failed activation" rather than "active
  link failure". Retries are therefore no longer instant.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IC55615

• APAR is sysrouted TO one or more of the following:

  JR28892

Modules/Macros

• APPN
  

Fix information

• Fixed component name

  COMM SERV NT 6.

• Fixed component ID

  5639F2503

Applicable component levels

• R613 PSN

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