It is not compatible with wordpress 2.0, here is request and responses for a default installation:

```
POST /wordpress-2.0/wp-login.php HTTP/1.1
Host: 192.168.172.130
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Content-Type: application/x-www-form-urlencoded
Content-Length: 73

log=admin&pwd=admin&redirect%5fto=/wordpress-2.0/SQZNycev&wp-submit=LoginHTTP/1.1 302 Found
Date: Mon, 23 Sep 2013 21:07:49 GMT
Server: Apache/2.2.22 (Ubuntu)
X-Powered-By: PHP/5.4.9-4ubuntu2.3
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Last-Modified: Mon, 23 Sep 2013 21:07:49 GMT
Cache-Control: no-cache, must-revalidate, max-age=0
Pragma: no-cache
Set-Cookie: wordpressuser_57b8b9d9751682d00894b06a4ecc62f7=admin; path=/wordpress-2.0/
Set-Cookie: wordpresspass_57b8b9d9751682d00894b06a4ecc62f7=c3284d0f94606de1fd2af172aba15bf3; path=/wordpress-2.0/
Location: /wordpress-2.0/SQZNycev
Vary: Accept-Encoding
Content-Length: 0
Content-Type: text/html; charset=UTF-8

```

Btw didn't know this about wordpress-2.0:

```
>> Rex::Text.md5("admin")
=> "21232f297a57a5a743894a0e4a801fc3"
>> Rex::Text.md5("21232f297a57a5a743894a0e4a801fc3")
=> "c3284d0f94606de1fd2af172aba15bf3"


Set-Cookie: wordpresspass_57b8b9d9751682d00894b06a4ecc62f7=c3284d0f94606de1fd2af172aba15bf3; path=/wordpress-2.0/
```