Hello Sabarinathan,
You should not use ~webgui AND ~itsmobile in the same service. Both are mutually exclusive.
You need to decide whether your application should be executed in a handheld device (ITSmobile application) or in a regular web browser (WEBGUI-based).
As Utkarsha mentioned, you should use the redirect mechanism to force the logoff, deleting then the session token.
Regards,
Cris