IT11530: LISTENER THREAD MAY NOT BE ABLE TO BIND TO PORT WHEN USING IPV6 ADDRESSES

APAR status

• Closed as program error.

Error description

• The listener thread may receive an OS error when trying to bind
  the port with an IPv6 address. This results in an AF similar to:
  
  Assert Warning: Unable to bind to the port (18105) on the host
  () for the server (server1).
  
  Stack for thread: 11 soctcplst
  
  (oninit) afstack
  (oninit) afhandler
  (oninit) afwarn_interface
  (oninit) listen_af_alarm
  (oninit) lisnsocket
  (oninit) tlListen
  (oninit) slSQIlisten
  (oninit) pfListen
  (oninit) cmListen
  (oninit) alListen
  (oninit) ASF_Call
  (oninit) sql_listener
  
  This may occur when using a specific IPv6 address other than the
  loopback address ::1.
  
  This problem may occur on releases of Linux where the option
  "myhostname" is permitted for the hosts entry in
  /etc/nsswitch.conf. The presence of this entry avoids the need
  to enter the host's specific IP address into /etc/hosts and will
  result in an IPv6 address being used by the listener thread if
  IPv6 has been configured for at least one network interface. Red
  Hat 7 is one such OS version where this option is available.
  

Local fix

• The workaround is to allow the bind operation to use any of the
  available IPv6 addresses on the server by prefixing the hostname
  or address in column 3 of the sqlhosts file with an asterix "*".
  Alternatively if IPv6 is not required it may be disabled by
  setting the environment variable IFX_DISABLE_IPV6 or creating
  the empty file $INFORMIXDIR/etc/IFX_DISABLE_IPV6.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * informix user with IPv6 enabled                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IBM Informix Server 12.10.xC6                      *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IBM Informix Server 12.10.xC6
  

Temporary fix

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Comments

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APAR Information

• APAR number
• IT11530
• Reported component name
• INFORMIX SERVER
• Reported component ID
• 5725A3900
• Reported release
• C10
• Status
• CLOSED PER
• PE
• NoPE
• HIPER
• NoHIPER
• Special Attention
• NoSpecatt
• Submitted date
• 2015-10-01
• Closed date
• 2015-12-30
• Last modified date
• 2015-12-30