I am getting around 2,500 type 500 URL errors in Google webmaster tools. These pages are faceted navigation results that can not be reached by a site visitor. These pages do not exist. We are using faceted navigation with the Volusion platform (asp.net, I think).
I have specified URL parameters in webmaster tools so that Google will not try to index anything faceted. This does not stop the errors from generating.
I am concerned about how this might effect SEO (bleeding page rank).
I can provide additional information if needed. I am not sure how to solve this. I have started down the path of creating 301's, but having some difficulty there as well.