Fix (APAR):  PK54131

Status:  Fix

Release:  6.1.0.11

Operating System:  AIX,Linux,Solaris,Windows

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  7872

Date: 2007-10-08

Abstract:  If a UDP packet was to try and be sent outbound with the UDP channel that was not able to be resolved by DNS, the UDP channel shutdown and caused all subsequent write failures.

Description/symptom of problem:  
PK54131 resolves the following problem:

ERROR DESCRIPTION:                                              
Sending an outbound UDP packet with an address as being         
un-resolvable causes pre-mature shutdown on UDP channel instance
tested in 6.1.0.11                                              

LOCAL FIX:                                                      
There is no workaround known                                    

PROBLEM SUMMARY

USERS AFFECTED:
All IBM WebSphere Application Server version
6.1 users of Session Initiation Protocol
(SIP).

PROBLEM DESCRIPTION:
If a UDP packet was to try and be sent
outbound with the UDP channel that
was not able to be resolved by DNS,
the UDP channel shutdown and caused
all subsequent write failures.

RECOMMENDATION:
None

The UDP Channel used in SIP was treating the error returned by
the send method on a DNS lookup failure as a failure of the
channel.

PROBLEM CONCLUSION:                                             
The fix resulted in ensuring that the DNS lookup                
is resolved before calling the send method.                     
                                                                
The fix for this APAR is currently targeted for inclusion       
in fixpack 6.1.0.15.                                            
Please refer to the recommended updates page for delivery       
information:                                                    
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980   


Directions to apply fix:  
NOTE: Choose the:
1) Release the fix applies to
2) The Editions that apply
3) Delete the Editions & Methods that do not apply and this Note

Fix applies to Editions:
Release 6.0
__ Application Server (Express or BASE)
__ Network Deployment (ND)
__ WebSphere Business Integration Server Foundation (WBISF)
__ Edge Components
__ Developer
__ Extended Deployment (XD)

Install Fix to:
Method:
__ Application Server Nodes
__ Deployment Manager Nodes
__ Both

NOTE:
The user must:
* Have Administrative rights in Windows, or be the Actual Root User in a UNIX environments.
* Logged in with the same authority level when unpacking a fix, fix pack or refresh pack.
* Be at V6.0.2.2 or newer of the Update Installer. This can be checked by reviewing the level of the Update Installer in file <was_root>/updateinstaller/version.txt.

The Update Installer can be downloaded from the following link:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg21205991

For detailed instructions to Extract the Update Installer see the following Technote:
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg21205400

1) Copy PKxxxxx.pak file directly to the maintenance directory

2) Shutdown WebSphere
Manually execute setupCmdLine.bat in Windows or . ./setupCmdLine.sh in Unix from the WebSphere instance that maintenance is being applied to.

3) Launch Update Installer

4) Enter the installation location of the WebSphere product you want to update.

5) Select the "Install maintenance package" operation.

6) Enter the file name of the maintenance package to install (PKxxxxx.pak file which was copied in the maintenance directory).

7) Install the maintenance package.

8) Restart WebSphere

Directions to remove fix:  
NOTE:
* The user must have Administrative rights in Windows, or be the Actual Root User in a UNIX environments.
* FIXES MUST BE REMOVED IN THE ORDER THEY WERE APPLIED
* DO NOT REMOVE A FIX UNLESS ALL FIXES APPLIED AFTER IT HAVE FIRST BEEN REMOVED
* YOU MAY REAPPLY ANY REMOVED FIX

Example: If your system has fix1, fix2, and fix3 applied in that order and fix2 is to be removed, fix3 must be removed first, fix2 removed, and fix3 re-applied.

1) Shutdown WebSphere
Manually execute setupCmdLine.bat in Windows or . ./setupCmdLine.sh in Unix from the WebSphere instance that uninstall is being run against.

2) Start Update Installer

3) Enter the installation location of the WebSphere product you want to remove the fix.

4) Select  "Uninstall maintenance package" operation.

5) Enter the file name of the maintenance package to uninstall (PKxxxxx.pak).

6) UnInstall maintenance package.

7) Restart WebSphere

Directions to re-apply fix:  
1) Shutdown WebSphere.

2) Follow the Fix instructions to apply the fix.

3) Restart WebSphere.



Additional Information: