Linux
How to Open Port in CSF Firewall
How to Open Port in CSF Firewall Login to your dedicated server with root Add the following lines in your /etc/csf/csf.allow: tcp:in:d=XXXX:d=aa.bb.cc.dd tcp:out:d=XXXX:d=aa.bb.cc.dd Where is XXXX port number, aa.bb.cc.