Hi Ratikanta,
If Server where dongle installed shut-down unexpectedly then all the sessions automatically disconnected, mentioned error occurred if any application disconnected/crashed unexpectedly. For this situation you need to add hasp_rt.exe in application directory, it will immediately disconnect the session whenever application shut-down unexpectedly.
For further query please send one email to "support@safenet-inc.com".
Thank You,
Anubhav