This issue occurs due to a number of temporary files which are not cleaned up (a process that occurs during a graceful shutdown). To remove these files manually, we must connect to the appliance using an SSH shell session.
To connect to a shell session you need to login to Websense Appliance Manager first then under Administration --> Toolbox, click Technical Support Tools and find the passcode under "Websense Remote Access". This is the password used for SSH which is randomly generated by the appliance.
After the temporary files have been removed, restart all websense services. This can be done from the Websense Appliance Manager website or from the shell by running the following command:
Now all the Websense services on the appliance have returned to a running healthy state.