Document REMOTING_SERVER_ADDRESS env var usage to fix VPN related issues

[mkundu1]

[seanpearsonuk]

Is there any way to make this env var unneeded by updating the server code in some way?

[mkundu1]

Previous findings:

Here is the equivalent python code for determining the ip address in server:

We choose the first ip address from the above list. In my case, when VPN is connected, the first one is incorrect, and I need to set the second one to REMOTING_SERVER_ADDRESS to get the connection working. The list order seems to be determined by the operating system. I've experimented with some network settings as per this post to change the network adaptor priority but that didn't help.

[mkundu1]

We can try to determine the correct ip address before launching Fluent using a fake grpc server which we'll set to REMOTING_SERVER_ADDRESS during launch_fluent.