Long story, so I won't bother with HOW it came up, but I'm intrigued by the fact I tried to login to a site but was told that my "computer" had tried too many times to login unsuccessfully and I should use a different computer.
Banks etc. simply lock the account - 'which computer' does not matter.
I cleared my cache, history, cookies and refreshed to a new IP address with my ISP - still I got the message "The computer you are using no ..."
I'm intrigued, as I have a voting system on my site that simply uses IP addresses to block people from repeatedly voting within a 48 hour period. Not much help if they've got a freebie proxy IP rotator.
What coding tells you which "computer" is trying to login/vote?