Can't open port 3306 for remote connection

Question

I understand this question has been asked but they all say the same thing which I have tried and failed.

Basically using this site: http://www.yougetsignal.com/tools/open-ports/ I can see my 3306 port is closed and trying to get a client to connect remotely is not working. I have changed the /etc/mysql/my.cnf file to both commented out bind-address and also change it to 0.0.0.0 but neither worked.

I have tried iptables -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT but it doesn't seem to do anything.

My iptables all show ACCEPT

-P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT

ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Does anyone have any other idea as to why this port is still blocked?

Thanks

Additional information [EDIT]

When I try to use: mysqli_connect('XX.XX.XX.XXX', "DBUSer", "DBPassword", "DBName", 3306); it gives my the error PHP Warning: mysqli_connect(): (HY000/2003): Can't connect to MySQL server on 'XX.XX.XX.XX (60)

I also typed into my server: ufw status; Status: inactive

Answer 1

Thanks everyone.

Turns out the team that set up the server needed to make a change on their end. They didn't say specifically but it opened the port up. (I imagine it was a firewall setting)

I also had to grant privileges to all host with:

GRANT ALL ON *.* to DBUsername@'%' IDENTIFIED BY 'DBPassword';

I had always seen the DBUsername@'xx.xx.xx.xxx' and didn't know I had to '%' it to work for all IPs.

Thanks