aspnet error when panel session expire

Each time when control panel session time out it show asp.net error. This is very irritating for customer and gives wrong image on control panel functionality.
How could we resolve this issue where panel show other page instead of .net error ? 

This issue has been going on for a while now.  At least through builds 7 and 8, maybe even previously.   I've reported it multiple times.

You can resolve this problem using these steps

1. Access the web server machine and go to HC installation location x:\program files\advanced communication\hosting controller\web folder
2. Open web.config file in a notepad
3. Change " CustomError = Off " with " CustomError = On "
4. Save file

Now panel will show login page instead of .net error whenever session will expire.

great info ... I think in next build it should be fixed.