I get onto the servers I use just fine, but I hear DalNet has been shutting their servers down; so if that's where you're trying to go, that may be the problem.
If you go to www.google.com and search for things like "file sharing communities" or "peer to peer file sharing software" you'll get results like Gnutella, Songspy, WinMX, Wired, Scoure, Limewire, etc.
a d.o.s. attack. my incredibly technological girlfriend is keen on telling me this stands for "denial of service" and it's an extremely stupid lamers' thing to do consisting in a lot of people sending requests to the server at the same time so that it can't process anything anymore.
at least that's what she's told me. in my brain it all translates to "evil gnomes from outer space are sticking peanut butter on the beautiful little elves' magic wands", of course.