GameSpy has recently come under new ownership by a company called Glu Mobile.  Unfortunately it looks like the first thing the incoming regime did is what happens a lot in corporate takeovers, they trimmed the fat so to speak.  With that they shutdown a lot of multiplayer servers for several older PC games.  Many co-op titles like Neverwinter Nights, Hidden and Dangerous 2, SWAT 4, and Star Wars: Battlefront no longer had any multiplayer functionality - though some games do allow LAN or direct connection options.