Basically the issues occurs in Thread and the database connectivity. Even the thread has not been launch to particular database it will be in closed state as unexceptionally thread hangs or disconnect from the Client

► Speed of the network

► Accessing one system from another system

► Speed of the internet through network

► Load of the net work

► Stress

► Try to change the IP address of ur system with another system IP

► Try to change the firewall setting to access un athorised sites

► Try to change the proxy settings to access un athorised sites