Change SSH Port

I decided to change my SSH port. I red an Article about it.

Quote:

At command prompt type: pico /etc/ssh/sshd_config
Scroll down to the section of the file that looks like this:
Code:
#Port 22
#Protocol 2, 1
#ListenAddress 0.0.0.0
#ListenAddress ::

Uncomment and change
#Port 22
to look like
Port 5678 (choose your own 4 to 5 digit port number (49151 is the highest port number)
Uncomment and change

#Protocol 2, 1
to look like
Protocol 2
Save file and restart SSH

And I do all step. I change Port 22 to port 8443 . But Now I cannot loging to root via port 8443 . WHy?

How can I change this port to 22.