Your administrator hast set up the number of log in attempts for your account.
After the defined number of incorrect login attempts your account will be blocked for a certain time (between 5 and 60 min.).
You get also an email with the notification that your login tries have failed several times.
If you have forgotten your password or your domain please refer to Forgot Password, Forgot Domain.
Failed Log in Attempts documented in Audit Trail
Failed Log In Attempts will also be documented in the Audit Trail.