I was getting the above error message when I recently tried to set up and try out Windows Live Writer to let me publish to a blog from my desktop without logging into the Admin section of the site. I was felled at the first hurdle when, after entering my b2evolution blog’s details, I was presented with a message informing me that:
The server reported an error with the following URL:
http://www.blog-domain.com/b2evo-path/xmlsrv/xmlrpc.php
403 Forbidden
Thinking it might be a problem with b2evolution, I tried with a WordPress blog. A different message appeared, both on this blog and another: