Way back in the day I played Star Wars: Galaxies (SWG) for a long time. Later on (10+ years ago) SOE shut down the entire game. Since then, there have been some communities of privately run servers pop up, and if you had the original game discs, you could run their launcher (which modified the server locations, etc.) to play. Are questions about those kinds of games (specifically ones where there is no longer an official server available) considered on-topic here?
Without knowing your exact question it would be hard to say whether your question is on or off topic.
Saying that, I wouldn't vote to close a question as off-topic purely because it was based on running a copy of the game on a private server. We allow questions asking about how to use software not released by the game's developer/publisher in conjunction with your game. We have plenty of questions in the realm of emulators.
We even have examples of questions asking about running games on servers once the "official" servers have been shut down:
Note, we allow questions about:
Game-specific hardware and utilities
As explained in Why are questions about piracy and related issues off-topic?, the questions are on topic as long as it's legal to play the games.
Regarding SWG, I note this from wikipedia:
"The servers aren't using any official SOE code which makes it technically legal"
At least one server, SWGemu, has a Q and A on its homepage explaining why it is legal.
Unfortunately, a statement from wikipedia or one of the servers in question without a citation is hardly definitive, and being sure on this topic would probably require a lawyer making a close read of the TOS and analyzing what exactly the 3rd party servers are doing. I'm not a lawyer, nor have I read the complete TOS.
According to What's our procedure for asking about not-quite-legal games?: "When it comes to legality, we tend to err on the side of assuming good faith here". My interpretation of "assuming good faith" is that a question about SWG (or a similar game) would be on topic unless/until evidence that the servers are in fact illegal surfaced.