This error may come due to following reasons, if you come across such errors look into these probable reasons:
1. When the machine IP or domain name you have specified is down.
2. The port no which you have specified is not open at the specified machine.
3. No program or process is listening on the specified port no.
4. Or may be active firewall is there at the specified machine and its blocking the incoming connection at the port.
Solutions you can try :
