I've searched the forum, but didn't find anything that leapt out at me regarding this problem, so. . . .
First, the set up. I have a LinkSys router that all my machines connect to, then to the DSL. All ports are forwarded correctly, the server can be seen in FSHost, and players are able to connect - just not all players. FWIW, this server has been up and running for over a year with few problems that weren't caused by the administrator(me)

I know that trying to connect to my own FSHost machine from my gaming PC(on the same network) is problematic. However, within the last couple of weeks, all of a sudden, the server has decided NOT to allow more than 2 or 3 players on at a time. Prior to this problem, we had been able to have 5 or more players(including myself!) logged into the server and playing quite well.
As noted, now only 2 or 3 players can connect at the same time. I have looked at the server, looked and re-looked at the software, checked my router settings, had players try a couple of things, but nothing seems to affect it. I have not changed any settings inside the router, nor changed the settings in the server software.
I cannot figure out what the issue is - there is nothing to indicate the server is malfunctioning, there have been no changes to the settings on the router, no option settings changed in the server program, and I've still got the same DSL that I had before. . . I'm stumped.
Anyone have any ideas or thoughts? Any help appreciated. . .
Randy
http://classiflight.com