Event 4005 - WinLogin [Windows logon process has unexpectedly terminated]

Hi,
 
I am facing an issue with published application which is hosted in RD session host.
The Event viewer application logs shows as 4005 -[Windows logon process has unexpectedly terminated]
when we are launching the application via RD web access, it just simply hangs and it process nothing.

Thanks,

Rocxie Dan