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Safe to open up port 3306 outgoing?

Posted by craigedmonds, 05-10-2012, 09:50 AM

Hi, I have a client who is running a script which connects to a remote mysql server. He was telling me that the connection was being blocked. So I have allowed port 3306 outgoing with CSF firewall and now the connection works. Is there any security issue with doing this?

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Posted by gigatux, 05-10-2012, 09:56 AM

A port is just a port at the end of the day. 3306 may be used for remote MySQL, but anything can still use that port. If you wanted to be super-safe, you could add some iptables rules to only allow 3306 out on a specific IP address, but it's not too much of a risk to allow this. Note that if there is an awful lot of data transfer on this connection, it probably won't be included in any bandwidth accounting.

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