Trouble with HTTP status message rule

[Research <research () nativemethods com>]

Hello,

I am currently writing a rather basic rule to track 404 resource not found instances in Snort on a web server.  While I 
am aware that the logs for the web server process themselves track this, I’d like to generate a Snort rule that does 
the same for some testing.

Currently my rule is:

        alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS \
                (msg: "Web resource not found"; flow:established,to_server; content:"404"; http_stat_code; priority:4; 
sid:2000110; rev:001;)

I have used the http_stat_code modifier for the content, but when I attempt to locate a non-existent resource:

        http://mywebserver.com/notthere

…the rule does not fire.

I was wondering what I am missing.

Thanks

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