Firewall open ports behind nginx

[dlukt]

The documentation could be better in that regard.

It says

The above 21115-21117 are the minimum required ports for RustDesk to work, these handle the signal and relay ports as well as NAT traversal.

What does port 21116/udp do?
The nginx config file takes care of ports 21114,21118,21119.

Do this mean that I have to open 21115-21117/tcp and 21116/udp only, if running behind nginx?

[dlukt]

If the above is true, I wrote a firewalld service xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Rustdesk</short>
  <description>RustDesk is a full-featured open source remote control alternative for self-hosting and security with minimal configuration.</description>
  <port protocol="tcp" port="21115-21117"/>
  <port protocol="udp" port="21116"/>
</service>

[dlukt]

The above is correct