In reply to Bill Murray.

In January my 1&1 web hosting closed the administration of all hosted Wordpress sites due to force attack.
I am using a strong password and an identifier different than "Admin". I didn't have any problem and I think this will prevent main problems on such attacks. Thanks to that they exceptionally reopen my administration access. I was probably one of the single user during those 4 force attack days.
I haven't hear anything in February. Will see....