First solution: Try resetting your router (idk)
Second: Are you on the right update? The server only runs on 1.7.2 and 1.7.4
Third: Maybe the server was resetting or was down at the time. Idk I'm not on.
Fourth: If not any of these, I think you should check your computer... also check on the status page to see if there are any problems.
I was banned from cube falsely and I submitted a ban appeal. I went to check on it and it said this user has not infractions or something like that. I went to check if I was unbanned and it said your connection is blocked. Does this mean I was ip banned?