IC92507: DATAPOWER DOES NOT USE NEXT DNS IN THE LIST AFTER RECEIVING "SERVFAIL"

Fix packs for DataPower XML Security Gateway version 6.0
Fix packs for DataPower B2B Appliance version 6.0
Fix packs for DataPower Integration Appliance version 6.0
Fix packs for DataPower Service Gateway version 6.0

APAR status

• Closed as program error.

Error description

• When communicating to a DNS server, if DataPower receives a
  server failure
  message, DataPower does not use the next DNS server in the list.
  

Local fix

Problem summary

• Affected are DNS configurations with multiple
  DNS servers and the round-robin algorithm.
  
  In case a DNS server returns an error response code, Datapower
  might wait up to one second and then retry the query to the same
  server, causing an unnecessary delay before trying the next DNS
  server.
  
  This is due to an incorrect algorithm handling DNS
  error responses. The fixed code generates a query to the next
  DNS server immediately on reception of an error DNS response.
  

Problem conclusion

• Fix is available in 4.0.2.14, 5.0.0.9 and 6.0.0.1.
  
  For a list of the latest fix packs available, please see:
  http://www-01.ibm.com/support/docview.wss?uid=swg21237631
  

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

  DATAPOWER BLAD

• Fixed component ID

  DPBLADE01

Applicable component levels

• R402 PSN

     UP

• R500 PSN

     UP

• R600 PSN

     UP