PI39193: EDGE ULB(USER-SPACE LOAD BALANCER, OR LB FOR IPV4 & IPV6) CRASH WHEN ULB TRIES TO USE AND FREE EPHEMERAL PORT 0.

8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• Edge ULB(user-space load balancer, or LB for IPv4 & IPv6) crash
  when ULB tries to use and free ephemeral port 0.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Customer using NAT feature.                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Load Balancer for IPv4 and IPv6         *
  *                      crashes when NAT is configured and      *
  *                      lots of RST packets are sent by the     *
  *                      client.                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Load Balancer for IPv4 and IPv6
  crashes when NAT is configured and
  lots of RST packets are sent by the
  client.
  

Problem conclusion

• Crash is avoided by freeing the internal port record when RST
  is received. Fix will be available in uLB 8.5.5.8.
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  WS EDGE LB IPV4

• Fixed component ID

  5724H8812

Applicable component levels

• R850 PSY

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