Question about subnet mask changes

[pabumake]

Heya folks!

I've run into a little problem and after 2 days im still like where i started out.

I've set up a a new Monitoring Machine to Monitor our services in our external Datacenter.
The only slightly thing I've changed was the Subnetmask to the right one ( yeah other services are still running with a wrong /24 subnetmask but are still working like expected ... don't ask me why im trying to figure it out). At the start i was able to ping and even to get the monitoring data from our cPanel host from the specific port.

But after i needet to restart the cPanel the connection is not working anymore from the new monitoring infrastructure. Pinging from cPanel to the Monitoring machine just works like expected. And hell yea I have watched a ton of logs from our Firewalls between the connection.

So my question is could it be the wrong subnetmask on cPanel side and how can i change this?

Thanks in advance!

 

[cPanelMichael]

Hello,

Are you using any firewall management utilities such as CSF on the cPanel server? If so, ensure to whitelist the IP address of the monitoring server to ensure the firewall rules are not blocking access.

Thank you.