Unable to Connect to ARIS Design Server over the Internet (via http)

Good day, esteemed colleagues!

Once again, I am forced to turn to you for assistance in resolving an issue. So, I need to connect to the ARIS Design Server (ver 10.0.17.0) over the Internet, at least via HTTP.

Here's what I have configured at the moment:

1. The load balancer listens on the standard port 80.
2. In the firewall, I have allowed connections on port 80 via TCP/IP and UDP from all types of networks.
3. A static external IP address is assigned to the router.
4. NAT is configured on the router for port 80. I can connect to the router's IP address using telnet on this port.
5. The physical connection definitely works, as I can connect to the physical server via RDP.
6. All ARIS components are running and functioning correctly; I have verified this.
7. When configuring the connection in the remote ARIS client, I specify the external static IP address of the router, port 80, and the correct username and password.

It seems that everything is set up correctly. However, I cannot connect over the Internet :( There is no information about my connection attempts in the loadbalancer logs. At the same time, I can connect from the local network to the server without any problems. In the installation and server configuration documentation, as well as here on the forum, I couldn't find an answer (perhaps I missed it, but I honestly tried to find information before asking the question).

It seems to me that I am missing some setting that prevents me from connecting. I ask for your help and advice.