unable to get gzip working

[J. Kevin Robbins]

I got it working on my local copy of Tomcat by editing the server.xml like so:

<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000" redirectPort="8443"
compression="on" compressionMinSize="1024"
noCompressionUserAgents="gozilla, traviata"
compressableMimeType="text/html,text/xml,text/plain,text/javascript,text/css"/>

But when I make the same change to my test server, gzip does not get enabled. I'm using YSlow and Firebug to view the requests. Both servers are Tomcat 6.0.xx, the local one (working) is running on Windows 7, the test server is running on RHEL4. There are no errors in the log. The responses from the server have the expected content-type, (i.e. text/html).

Multiple sources on the net say that this is the only configuration required, but it sure looks like I've missed something. Any ideas?