Have a large install of multiple sites. For some reason in the last couple of months seeing a large jump in Google webmaster tools/search console 404 errors pointing to URL in this format even though we of course are using full friendly URLs (root//about-us/locations). Pages have not changed.
en-US/Default.aspx?TabId=1234
What is odd is they weren't there for months before and started showing up. Only major changes made on these sites in that time period are a skin change and implementing DNN site search, but I see no evidence of problems there.
Any ideas on how to track this down? Or possibly a wildcard filter in robots.txt to prevent the 404s?