Rustdesk on proxmox VM

Hi. My self-hosted instance of rustdesk was installed from the script https://raw.githubusercontent.com/techahold/rustdeskinstall/master/install.sh. The VM has 2 networks, 10.10.10.0.0/24 and 192.168.0.0.0/24.

All necessary rustdesk ports are forwarded through nftables to the VM itself and are available.
Internal clients access the rustdesk server by domain name (overridden hosts file temporarily). External ones are accessed by global DNS.

There are some clients that I want to connect to the rustdesk server. Some virtual servers in proxmox (on the internal network 192.168.0.0.0/24) and also external clients.

Internal clients can work with rustdesk without problems. The external ones have an error message that the connection to the server is not made, but still can connect to the internal clients.

Internal clients cannot connect to external clients. External to external clients can't connect to external clients either.

Start by reviewing the reported nftables port forwarding, DNS behavior, and the VM's two network ranges. Reproduce the internal-to-external and external-to-external connection failures, then verify that all intended client directions work through the RustDesk server.