Classic servers currently hard to connect to. Here's why.

[Krawkyz]

WoM has fixed the issue. Minecraft.net is still undergoing issues.

No updates have currently been given on minecraft.net and how they are fixing problems (as of the forums).
WoM should be updated to 2.0.6.

[Juwayyid]

Wait, mine craft the site was hacked?  Or just the insomniac servers? 

[Krawkyz]

minecraft.net servers were "hacked" and servers were duplicated to lag the server list.

[Ejay845]

Yaay! Good news, I see Insomniac servers, bad news, I now see the Connection Refused: Connection
error popup on my screen when I click it. Hopefully the servers are just down

[Saracalia]

I haven't had that problem yet.

[bren4q]

This was a problem for a week or two at the end of December as the dates on the original posts here would indicate. Its been resolved for a few weeks now.