Session Timed Out

We are using Dell Wyse 3040 zero clients. They are setup to connect using PCOIP to Vmware. We have approximately 6 machines we setup to Auto Login. However, sometime after 8 hours of not being used we get a message that say "Session Timed Out" or our users will just come in and the screen will be prompting them for credentials. After they restart it will login the Account we setup in the WMS. Anyway to keep them from timing out. 

I thought it would have something to do with the Inactivity settings. The current settings are: 

Inactive: 0

No Session Timer: 0 

Action After All Sections Exit: None

We do not want the Vmware Session to disconnect.