log in problem

We would need more detail to really answer your question. Many people have been having issues logging into WordPress since som hosting providers has block it due to high volume of attacks recently.

I would contact your hosting provider and ask them if they are blocking access to wp-login.php

No – both lead to the same login page. But as Justin said, due to mass attacks, many hosts have been implementing security measures for WordPress logins. You really need to speak with them about this to confirm that they have made the changes.

I’d also suggest reviewing http://ww.wp.xz.cn/support/topic/brute-force-attacks-and-wordpress and Brute Force Attacks.