Gents,This appears to be an issue for Linux, Apache 2.2.15, compiled from source... extfiler=shared....Whilst you are able to execute ExtFilters on local files, a Reverse Proxy configuration does not work the same way.This has been reported here:Config:<VirtualHost *:80>ServerAdmin webmaster@xxxxxxxxxxDocumentRoot /usr/local/apache/htdocs/ServerName search.domain.comServerAlias search.domain.comErrorLog logs/search.domain.com-error_logCustomLog logs/search.domain.com-access.log combined<Proxy balancer://domain.com>BalancerMember http://ip1BalancerMember http://ip2</Proxy>ExtFilterDefine fixtext mode=output intype=text/html cmd="/bin/sed s/html/HTML/ig"SetOutputFilter fixtextRewriteEngine onProxyPass / balancer://domain.com/ProxyPassReverse / balancer://domain.com/</VirtualHost>I am completely out of thoughts on this matter. If you guys could help, that would be wonderful....Thanks!VasiliyPS Removing the revproxy, and things work like a charm.