Uninstall of the portal can be achieved by using the Tomcat Application Manager. You will require to use an appropriate userid and password to login to the Application Manager. Usually, typing in the base url of the server host will be sufficient to bring up a Tomcat page where you can select the Application Manager link. Once signed in to the Application Manager, a list of applications will be displayed. Choose the portal application (usually astrogrid-portal) and select the undeploy command. You should ensure any settings you may require in the future have been recorded first.