If you have access to the database through phpMyAdmin, try emptying or truncating the 'strikes' table.
I think people have said that problem happens when you're using a proxy or cloud and it looks like everyone has the same ip address, then if anyone gets locked out, everyone's locked out.
If that's what the problem is, you can temporarily disable the strike system (although I guess you don't want to do that for very long), then figure out how to get things to use the right ip address. I'm not sure how to offhand, but I'll do a search, or maybe someone else will answer.
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