I have SharePoint 2010 web application with following Alternate Access Mapping defined:
Internal URL | Zone | Public URL
Application has claims authentication implemented. I am able to access
default.aspx using first three URL using Admin user(Domain admin user for first link and claims admin user for last 3). But when I try to access using last url using same user, I am getting access denied error. On checking fiddler, I found that for last URL, I am getting
404 response for certain files in "_layouts/images" folder. These are OOTB SharePoint images used in Default.aspx pages(/_layouts/images/fgimg.png).