ProxCP NAT Domain Forwarding
From ProxCP Documentation
On NAT nodes, ProxCP uses nginx reverse proxy to forward HTTP and HTTPS traffic to NAT virtual machines via domain names.
If using a NAT domain, forwarding ports 80 and/or 443 for HTTP/HTTPS is not necessary.
Default Web Page
ProxCP includes a default web page on NAT Proxmox nodes. This page is displayed if there is no valid nginx proxy configuration for a given domain. You can edit this default web page (/var/www/html/index.html) to anything you want.
Domain Deny List
ProxCP Daemon ships with a /nat/deny-domains.txt file. Any domains in this list cannot be forwarded for NAT by ProxCP users. The format is one unique domain per line. Sub-domains are also excluded if the root domain appears in deny-domains.txt.