We upgradet our WebSphere 6.1 from FixPack 23 to FixPack 25 including ApplicationServer Upgrade, HTTP Server Upgrade and HTTP Server Plugin Upgrade.

Now the jsessionid is not passed from the HTTP-Server to the ApplicationServer.

After checking the configuration I experienced a bit and got the result, that there is probably a bug (or misconfiguration?) in the HTTP-Server Plugin.

After downgrading the HTTP Server Plugin to FixPack 23 all works fine!!!

I don't want to run the productive System with a Fix-Mix, so I look for any information
regarding this problem.

Thanks in advance