SkyDrive Pro “Can’t connect to the specified SharePoint site…”

Also

“Sorry we are having some temporary server issues.”
Office Outlook reporting that it is not activated

Solution 1

This may be a bit extreme and you may lose other settings, but this was the only thing I found that worked.
Internet Explorer > Tools > Internet Options > Advanced > Reset
http://social.technet.microsoft.com/Forums/en-US/faf7380c-84c9-4b6b-b041-3006a20416c6/temporary-server-issue

Solution 2

My sub-site had unique permissions. When I removed the unique permissions, I was able to sync.

What did not help

Programs and Features > Office > Change > Repair

Windows Key – type credentials > Credential Manager > Remove a couple of the office credentials.

http://community.office365.com/en-us/forums/172/t/191873.aspx