How to change Hudson Jenkins default port.

The Hudson and Jenkins CI build servers run by default on port 8080.

To change this all you have to do is edit the hudson.xml or jenkins.xml
file respectively.
This file is located directly under the build server's installation directory.

You'll notice that the xml contains a <service> which describes the windows
service configuration.

Locate the argument --httpPort=8080 and replace the 8080 port with the one you want.

If you have enabled email notification also change the URL in the E-Mail Notification settings section
inside the Server settings:

Also change the URL of the e-mail notification settings.