Guys thought you might be able to help me on this:- Basics are we need to turn deflate compression off for IE6 SP1 machines (css, js and swf files) but leave deflate on for newer (greater than XP SP1). The total browser domain is IE6 and either SP1 (XP) or greater. We have been trying to put Rewrite conditions in the IHS >> HTTP.CONF files to cope with it:- <Location "/MyApp"> SetOutputFilter DEFLATE AuthType MamCookie AuthName MamCookie require valid-user RewriteEngine On RewriteRule (.*)/logoff\.do /MyApp/logon/logonService.do?&mamlogmeout RewriteCond %{HTTP_USER_AGENT} .*MSIE\ [6] RewriteCond %{HTTP_USER_AGENT} !SV1 RewriteCond %{REQUEST_URI} \.(css|js|swf)$ RewriteRule Accept-Encoding: .* $1 RewriteRule .* $1 RewriteEngine Off </Location> The last line does not run and we get a bad flags delimiters error on start up. we tried replacing the line with "RewriteRule .* $1 " IHS at least started but it didnt work. The code above was a bit of a guess from a few of us down here after hours of web searching.