CWP Running but websites down

Hello

CWP While running, websites suddenly stopped. I can access the PMA and CWP panel, but the websites are down.
I reset the server several times, but nothing has changed.


what could be the reason?

Thjank you

Scary! The basics of running a hosting service. 
There's even a GUI..
File Management, CWP->Log Viewer

Which log file should I review?

When you turn off the firewall, the sites are active again.

You've answered your own question.
IF you have access to the official CSF GUI then you can watch the firewall log in real time, when trying to open a site.
If not tail -f /var/log/messages (though good luck discerning the appropriate messages in amongst port scans).
tail -f /var/log/messages | grep your_ip_address   <-- might be better.

Try resetting the firewall rules
csf -f

Try resetting CSF
csf --profile backup broken
csf --profile apply reset_to_defaults
csf -r

How do you find out about of of this? Read the configserver CSF help.

Unfortunately, nothing changed. I had to turn off the firewall. I am trying to find a solution

Unfortunately, nothing changed. I had to turn off the firewall. I am trying to find a solution

I do hope that you don't host any clients!

hi remove any blocks and flush csf via this command :
csf -f

hi remove any blocks and flush csf via this command :
csf -f

As previously suggested.