There is different way/steps to trouble shooting your problem..

1. check whetehr ssh process running ps -ef | grep -i sshd | grep -v grep

2. check the port listen netstat -an | grep 22 | grep LISTEN

3. Run pfiles command on your sshd services process-id and see whether the port is been mapped to local host pfiles <pid> | grep -i port

4. last from client side try accessing via debug mode .. ssh -v <remote-host-name>