iTunes sign in error -50

So I recently upgraded to lion from snow leopard because it required 2gb of ram and I had 1gb. So I upgraded the ram and updated to lion. Now I can’t sign into the iTunes Store it keeps giving me error -50 try again later now I have tried everything yet nothing works. I have a really old iPhone that I was planning to use for music but I can’t sync anything because everything I have is not authorized. It won’t let me authorize it because every time I try I get error -50. I am using a iMac 17 inch late 2006