GGPO has been disabled by ponder, whether it’s temporary or permanent only time will tell.
Not to fear however, for Fightcade has stepped up to the plate. Fightcade to be honest, is pretty much a straight GGPO clone. But being a GGPO clone is not really a bad thing. The client has many more game lobby’s for use, so you don’t have to hack the rom into the unsupported games lobby anymore. The hacked client has a few new options such as customizable colors and challenge sounds. Most importantly, it’s still the same great rollback-based netplay code that you expect.
9 Months later and ggpo.net is still down. I would say it’s safe to say the Fightcade has completely replaced the GGPO service at this time.
Learn more about Fightcade here.