Hi, On Thursday, 13. March 2014 21:57:39 Ming Hou wrote: > Hi, > > I have upgraded my squid proxy from 3.1.23 to 3.4.4 with squidGuard 1.4. > > For some reasons, the redirection from the result of squidGuard throws out > the 404 error. However, I switch back 3.1.23 and the issue goes away. > > Any suggestion? please see this "bug" report: http://bugs.squid-cache.org/show_bug.cgi?id=3978 -> You need to patch squidguard to work with newer squid versions. Big thanks to Amos for providing the squidguard patch! Best regards, Thomas