Can not access Jenkins by --prefix value even if --prefix is set

Question

I have set the JENKINS_ARGS using /etc/default/jenkins and start jenkins as a daemon with the www-data user.

The system info page shows that --prefix=/jenkins is set

HOME /var/www HUDSON_HOME /var/jenkins JENKINS_ARGS --prefix=/jenkins

But still jenkins is only accessible via http://ip:port/ and not http://ip:port/jenkin.

I have also setting the Jenkins URL on the configuration page, but without success.

Do you know more if there is something else I should do?

This is my environment: Linux robopar12227 2.6.35-22-server #35-Ubuntu SMP Sat Oct 16 22:02:33 UTC 2010 x86_64 GNU/Linux java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.13) (6b20-1.9.13-0ubuntu1~10.10.1) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) Jenkins ver. 1.447