1. Login to your Customer portal
2 Select appropriate subscription from the drop-down menu (located at the top right of the interface).
3. Select your Cloud Server subscription and click on “Server Management”.
4. Start the firewall (enable the firewall rules):
csf -s
5. Flush/Stop the firewall rules.
csf -f
6. Reload the firewall rules.
csf -f
7.Allow an IP and add it to csf.allow.
csf -a IP
8.Remove and delete an IP from csf.allow.
csf -ar IP
9. Deny an IP and add to csf.deny:
csf -d IP
10.Remove and delete an IP from csf.deny.
csf -dr IP