Why did MySQL stops working once the port value is changed in my.cnf?

[Al Jey]

works fine:
[client]
port = 3306
[mysqld]
port = 3306

but once changed to:
[client]
port = 3307
[mysqld]
port = 3307

I get the following error:
ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

by the way, I've added the port 3307 to the firewall's exceptions list.
any suggestions would be greatly appreciated.

[Ian Smith]

Can you show the configuration files for both the client and the server?

[mwasif]

Did you restart the server after changing the port?
Did you provide the new port 3307 while connecting to it?