Discrepancy between SeoMoz vs Google Webmaster tools

[AndyHawkins]

SeoMoz reports over 70 4xx client server errors on my site, but Google Web Master Tools does not report any broken links. There are not any broken links on any of the pages that it is reporting. Could there be another reason for the 4xx errors besides broken links?

[My-Favourite-Holiday-Cottages]

I would manualy visit all the pages that aparently have 4XX errors, and use a tool to extract the responce-headers.

You may have a simila rproblem to on I had. Due to the way a legacy site I worked with worked, there were places where the responce header was set manulay. I actualy ended up with 404 pages returning 200 and vis versa.