Hi, Can anyone give me a brief explanation of why ISA strips the CSS from some of my published sites? If I enable the 'original host headers' option, it works Ok. I have a setup where requests go through ISA server, to an IIS server which is running a proxy filter, that then forwards requests to either IIS sites or another web server instance (Plone) running on the same server on a different port. This is a dev environment that mirrors our live, with the exception of the ISA server. If I try to access a URL through the publishing rule, that is actually served up by Plone (via the IIS ISAPI filter), the page is returned but the CSS is removed. If I try the same thing inside the dev environment (I.E. bypassing ISA) it works fine. Any help would be much appreciated. Thanks Mick