PQ69608; 4.0.2 - 4.0.5: Plug- in failover fails with proxy firewall
 Downloadable files
 
Abstract
The plug-in is not failing over as expected when a proxy firewall is between the plug-in and the WebSphere® Application Server.
 
Download Description
PQ69608 resolves the following problem:

USERS AFFECTED:
WebSphere Application Server V4.0 users of the Web server plug-in with a proxy firewall in between the plug-in and the Application Server.

PROBLEM DESCRIPTION:
The plug-in was not failing over as expected when a proxy firewall is between the plug-in and the Application Server.

The plug-in marks a server down when the connect() fails. However, when a proxy firewall is in between the plug-in and the Application server, the connect() will succeed even though the backend Application Server is down. This causes the plug-in to not failover correctly to other Application Servers.

Here is an example of how to specify the new attribute:

<ServerGroup Name="default_group">
<Server Name="default_server1" ExtendedHandshake="true">
<Transport Hostname="192.168.1.2" Port="9080" Protocol="http"/>
</Server>
</ServerGroup>


PROBLEM CONCLUSION:
The plug-in now performs some handshaking with the application server to ensure that it is up before sending the request. This allows us to failover in the event the Application server is really down. This is specified using the ExtendedHandshake attribute for the Server element in the plug-in configuration file (plugin-cfg.xml).

NOTES:
PQ69608 REQUIRES the latest WebSphere Application Server plug-in fix, such as WAS_plugin_03-07-2003_4.0.x_cumulative_eFix_<OS>.tar or any later.

This interim fix MUST be applied to the application server and ONLY for configurations with a proxy firewall between the plug-in and the Application Server.

This fix is included in WebSphere Application Server V4.0.6.
 
Prerequisites
WAS_plugin_03-07-2003_4.0.x_cumulative_eFix<OS>.tar
 
 
Installation instructions
Please review the readme for detailed installation instructions.
 
URL LANGUAGE SIZE(Bytes)
Readme US English 2756
 
Download package
What is DD?
DOWNLOAD RELEASE DATE LANGUAGE SIZE(Bytes) Download Options
PQ69608 1/10/2003 US English 871412 FTP DD
 
Technical support
1-800-IBM-SERV (US Calls only)
 
Problems (APARs) fixed
PQ69608
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > Servlet Engine/Web Container
Operating system(s): HP-UX
Software version: 4.0.5
Software edition:
Reference #: 4004450
IBM Group: Software Group
Modified date: Dec 16, 2004