That sketchucation.com site apparently had a makeover recently and instituted blocking of what it detects as malicious IPs or activity. Another user posted in their forums of being blocked for no reason, but getting a message to followup on if they think it's a false block. That user didn't follow through and had to contact the site admin to get it fixed. I recommend you try the same.
Link to that forum post:
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.