Please note that it’s not necessarily needed to whitelist our uptime monitoring IPs in your firewall. This should only be done if you are experiencing monitoring issues without whitelisting these IPs.
However, if you do wish to whitelist these IPs in your CSF, start by running the following command on your server’s SSH:
wget -q --output-document - https://hetrixtools.com/resources/uptime-monitor-ips.txt | awk '{print "csf -a",$2,$1}'
It will generate a list of commands that you would then need to copy/paste into your terminal to whitelist our Uptime Monitoring IPs.
Now, to whitelist these IPs, simply copy the entire output and paste it into your SSH terminal. The IPs will be whitelisted in CSF.
All done. Our Uptime Monitoring Nodes are now whitelisted in your CSF. You can verify this by opening the file ‘/etc/csf/csf.allow’ with any text editor. Our uptime monitoring IPs will be found in that file.