Check that the times are true on the device you are using. I found that when my dates were out I couldn't log in.

Maybe try create a second account and confirm if it is your connection rather than account.

I had an issue with this when I was overseas, it was due to the amount of ISPs in the 'loop' as I connected through. But in this instance I couldn't log into any 'https:' connections basically because there were so many ISPs involved I probably looked like a spammer to the security network, hence my inability to gain access.