I would like to block everything EXCEPT SSH/FTP/HTTP/POSTFIX and MySQL.
With "everything" I mean all the other ports, block pings etc etc.
migrated from stackoverflow.com May 9 '11 at 11:13
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I'm guessing you mean incoming connections (the INPUT chain), and not forwarded ones (as in a router). Also I take postfix means just SMTP (25).
Test your FTP connection in particular, you may need to enable