[Failed to Connect]

When i start my 2 servers, I can't connect to either. It pops up with "Failed to log in: null". My friends are able to get into the server I start. I initially thought it was a Mojang issue, but I figure if I can play single player still, I still own the game.

[World Reset?]

My world had been reset out of no where?? All i could think of something messing it up was resource packs that i just recently put in?.. Me and my friend tried to load in and its a fresh start :( 

Any way to bring back my old world?