Hi, I have a strange problem that I cant seem to resolve. Our company website is in the DMZ so all staff access from LAN >> DMZ without going onto the internet. When browsing using DNS name [http://mysite.co.uk] through IE nothing caches locally so all images, PDFs etc download each time wasting server resource. Oddly, if we access using IP [http:\\10.10.10.10]the local cache does work so I know its nothing to do with IIS or indeed local IE settings. External users can access the site using http://mysite.co.uk and there caching also works. To cap it all our development server sits on the LAN and caching works when accessing using DNS name [http://dev.mysite.co.uk]!! Does this sound odd?