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.dd -IP
For example:
tcp:in:d=22=192.168.0.100
Then run:
# csf -r
