There are a few places to adjust the Web Access Timeout for idle user sessions. In the below example, we'll be setting the timeout to 30 minutes:
Step I:
Open AppXtender Administrator
Go to Server Management - Web Services - Session Management
Change Session Timeout (min) to 30 and click Save
Step II:
Open IIS Manager
Navigate to AppXtender Web Access site, under Default Web Site\AppXtender
In Features View, double-click Session State
In the Time-out (minutes) field, type in 30 (or the value you have chosen in Step I)
In the Actions pane, click Apply
Navigate to Application Pools - select AppXtender .NET, go to Advanced properties, then Idle Timeout
Modify this value to 30 (or the value you have chosen in Step I) and click Apply.
These changes will require an IISRESET to take effect which should be done when users are not using the system.