Forge Mod Loader can't connect to server

Not sure why, but I was playing fine on FTB, but now I get this screen when trying to connect

Any clues? I've tried deleting the mindcrack folder and launcher, then redownloading both. Still no luck

 

ive been having the same problem, i cant seem to find anything on how to fix this

 

lol you guys...go to edit modpack and downgrade to version four. the server hasn't updated yet. although, it will probably be updated today around noon est