Once you figure out all the legitimate things that are getting blocked and add exceptions for them, it runs flawlessly in the background blocking anything that isn't legit or that's malformed. Whether it's an official hacking attempt or not, it blocks things that could possibly cause damage or waste your servers resources. That's enough reason right there to install this mod, get it set up properly and let it do its job while you focus on other things. Don't listen to the nay-sayers. Yes, it takes a little time getting it set up but once it's set up it's good to go and well worth the install/configuration. Excellent mod... nominated