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I have a site on a WHM/CentOS dedicated server using CSF. This 144.x.x.x server has a client who has a remote database on a different server (37.x.x.x) and he needs to connect his script from the local server over to that 37.x server using a remote MySQL connection.
Up until now all he gets when we try to connect is the error:

IP Be 144.x.x.xFailed to connect to MySQL: (2002) Connection refused

I am guessing that error means that 144.x is blocking outbound connections? If so, any idea what I need to open up in order to enable this outbound SQL connection? If not, any ideas on how to get this connection working?

Finally got it figured out on my own. Posting this here in case someone else needs it. In the csf.allow file add the following line:

tcp:in:d=3306:d=xx.xx.xx.xx

where the xx is the IP of the remote SQL server. For more info look at this page where I found the answer at: https://www.crybit.com/enable-remote-mysql-csf/

Hey, I also have the same issue. Thank you for your solution.