I recently updated the All In One WP Security plugin and sometime after I was not able to get into the WP Admin. I continued to receive a "403 Access Denied" error but only for wp-admin or wp-login.php.
My blog and all links worked fine. There were no appearances of any security breach and via FTP all files were intact. I first tried renaming the all-in-one-wp-security-and-firewall folder under plugins but that didn't help. I then checked the permissions of the main files/folders but they had not changed.
Finally I created a blank .htaccess file and uploaded it. I have a backup of the .htaccess prior to me doing this. Now I can get into WP Admin with no problems. However, what do I need to add to this file so your plugin continues to work? When I tried editing the original .htaccess (prior to me uploading a blank copy) the file is rather large so I'm not sure what might be in there that is invalid or may have caused the problem.
Any help is greatly appreciated.