Make sure “index.php” is enabled for directories.
I had the same problem, I could only login by a roundabout means. Have a look at this post:
What is the 403 error I get when trying to see my site?
Symptoms: You cannot seem to login after using the right username and password, into your admin account. You get an error message like:
You are not authorized to view this page
You might not have permission to view this
directory or page using the credentials you
supplied. If you believe you should be able
to view this directory or page, please try
to contact the Web site by using any e-mail
address or phone number that may be listed
on the personal.fredsmith.com home page.
You can click Search to look for information
on the Internet. HTTP Error 403 – Forbidden”Solution: If your account is hosted on a Windows server, it could be a problem with the Directory Indexes. The default configuration of the server is to load index.htm, index.html, default.htm, default.html, default.asp files.
WordPress is done in PHP so the default page is index.php. Now, this is not part of the default configuration so we need to add it. To do this, you need to click on Web Options in the Control Panel. Then scroll down to the Directory Indexes section to add index.php to the Directory Indexes.
It’s in http://codex.wordpress.org/FAQ_Installation
This could also, quite likely, be a problem with file permissions. If you are on a linux server, check that your .htaccess file has 644 permissions, and also check that your index.php has 644 permissions.
How do you enable index.php for directories? I think I need to do that.
