Maintenence already done on the Seraph server.
I tried it before and after maintenence, same BS every damn time.
Called the ISP, nothing is being blocked at all by them.
I doubt it's a problem with my videocard, the game runs perfectly and smoothly as it had run the entire month i've been playing up to this point, before getting disconnected. They say that the 4001 error is always due to Port Blockage, though I've even connected directly to my modem via DMZ, and it did not work.
I'm left with two more things at the moment...
Either I can change servers and maybe still play (could be that Seraph doesn't like me.... I did play for a month on Ragnarok),
Or I can reinstall the damn thing.

After that, if I can't get on the game, I swear I'm destroying all my FF sh1t, I'm so pissed that I can't play this game now after an entire damn month.