I'd install it on Red hat 9,and set the proxy value as 10.0.0.172:8080,
It works very well.For the proxy server problem,
I had to use the new ports, so I change the proxy server to 10.0.0.172:80, Referring to FAQ, I changed it in opera conf to the new proxy,but It cant work, When I start "snort -vd", It shows the connect the proxy 10.0.0.172:8080; I also changed the env, add the http_proxy=10.0.0.172:8080, and the same thing happened.

How do i changed the proxy?

Thanks