Help with Expl:Win/HTTP.URL.SQLInj!0000-0000

Hi guys!

I`m configuring NIS within TMG and i have a little trouble with definition signatures for common SQL injection techniques. Firtsly, I tested the NIS engine using a wide variety of signatures, as XSS, TEST, and exloiting, and the NIS system works fine. But definitions for SQL Injection (Expl:Win/HTTP.URL.SQLInj!0000-0000) doen´t seem to work. Does this signature need a special configuration?

Thanks guys for your and a big congratulations to all MVPs. Your work help us to understand better Microsoft technologies.