I started using Windows Live Writer for another blog mostly for the picture uploading and editing which is pretty nice. That said I had some issues behind a proxy which I only found when I enabled verbose logging. The major problem being that essentially the only error it gives in the GUI is “bad password.” Then I found out how to get it to use Windows Authentication behind a proxy and all was well. Essentially adding these lines to the exe.config file after the configuration element starts enables default authentication.
<defaultProxy enabled=”true” useDefaultCredentials=”true”> </defaultProxy>