How to set up DDos-Guard?

Question

Debian

There is an ISPmanager control panel, when the site was connected to ddos-guard.net, they gave out their Ip address, registered cloudfalre in the dns panel. When entering the site - error 502. Got into their knowledge base, found a lot of information about ip subnets that need to be allowed access. So, in the ispmanager itself in the firewall, I tried to completely allow access to these Ip and tried to allow access only to their ip, and to reject everyone else, the error was still 502. I tried to do it for ports 80 and 443, technical support sent "smoking the manual". Maybe someone came across the setting?

Answer 1

502 error is not related, almost certainly, to the firewall settings and addresses.
First of all, you need to look at the logs of your web server and it will be clear what exactly this error is and where to dig.
By setting up a firewall: In the case of using such protection services, it is necessary that only from their addresses you can be reached. Those. allow their subnets, prohibit all others on port 80/443. Perhaps some of your address / subnet is additionally allowed for testing.