Problem connecting BBB with mini usb cable using ssh

Hello friends,
I was previously using my BBB with ssh using miniusb. But now i am unable to access my BBB with ssh. I have tried with putty it shows “connection time-out”, tried with sftp in ubuntu and with remote system explorer in eclipse but the result was same.
I cannot access cloud9 ide at USR0(heartbeat) and USR(cpu process) is working fine. I tried changing the cable, tried with other usb-ports and also with other pc.
I am sure that BBB is working but there is some problem with ssh server in BBB. Any suggestions to get rid of this problem?

Thank you in advance.