Here we will change the ssh default port from 22 TCP to 3310 TCP. For SSH port change kindly login into your server, as root user via putty or console.
After that edit /etc/ssh/sshd_config

#vi /etc/ssh/sshd_config
######Look for the following line:
#Port 22
######Change the port to
Port 3210
#### Save sshd_config file with this command
:wq!

Restart SSH services with this command

#service sshd restart
or
#/etc/init.d/sshd restart

Try to connect to your server via putty, but you need to change the ssh default port to 3310.