This happened to me on yahoo. After my p.c. got infected by a virus and you get rid of it, too many attempts to get your mail leads them to give the error message. One reason is your cookies are not recognized. Since they want to be ultra careful that no one but you is trying to get into your a/c the more you try, the more suspicious it looks of someone accessing info that may not be really their own. I was really ticked off, until I understood that it was for my own safety. You may have to wait a day or so and even then have to go thru recognizing symbols, etc. to re-establish you are the person belonging to that account. It is terribly inconvenient, but by the same token, you don,t want someone else getting all your private info. I never was "infected" before, so it was a learning experience, that was terrible, but taught me that their reason was a valid one. Just be patient which is easier said than done.