NETCONF and GNS3

Greetings! I am working on a Python and NETCONF project using GNS3 and I can't seem to find any information on how to get this topology running.

First of all, here's the basic topology: https://i.imgur.com/cl1RDdz.png. The CSRv is running NETCONF fine and, it will be used to throw some basic commands like PING, traceroute, etc. The Ubuntu Docker basically runs the python scripts I made. Every device shown is reachable without any trouble and the topology is running on the GNS3-VM on a ESXi host.

The problem is that since NETCONF uses port 830 to establish connections, I've been trying to open it on the GNS3-VM with multiple commands but, none them did the trick.

What do you guys recommend?

Thanks in advance for the time!