More explaination when unable to join

[Langbart]

A user named Tirili asked about a problem where he could not join a game. The answers in the game itself and in the wiki/FAQ were insufficient.

​IRC 0ad-dev (19/Nov/21)

Tirili: And what might be the reason that some people can join and some can't?

elexis was asked and quickly helped out, but stressed that the information should be added to the MP dialog

[22:58:35] Langbart Hello, there is a user in #0ad-dev, who wants to have more answers to joinig a game. I already gave him your answer that I found in a closed ticket, but he wants more. "Tirili And what might be the reason that some people can join and some can't?"
[23:04:02] elexis do they refer to the identical host?
[23:05:14] elexis the typical case for one host server being joinable by some but not by others is that the host hasnt forwarded the port, is using stun, and then the clients that can join the game can utilize STUN, and the ones that cant join the server cant utilize STUN, and they  cant utilize STUN because the ISP or local firewall blocks it
[23:06:59] elexis https://en.wikipedia.org/wiki/STUN#Limitations
[23:07:05] elexis basically technical mumbo jumbo
[23:07:26] elexis the only thing in your power is to have the host forward their port
[23:07:45] elexis then he can disable STUN, this way everyone or noone will be able to join
[23:08:02] elexis I suppose this information should go into a dialog inside the game near the MP dialog