ThreatSentry 4.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The following version: 4.0 is the most frequently downloaded one by the program users.
The software lies within Internet & Network Tools, more precisely Network Tools. This software was originally produced by Privacyware. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
Don’t sweat unaddressed vulnerabilities, insider misuse, or new types of attacks. ThreatSentry combines a state-of-the-art Web Application Firewall and advanced behavioral components to block any activity falling outside of trusted parameters. ThreatSentry delivers enterprise-grade, multi-layered protection and compliance (i.e. PCI DSS) for Microsoft® IIS (5/6/7) at a small-business price!
You may want to check out more software, such as WMS Client for Arcview Beta, Usage Agent or SigX, which might be related to ThreatSentry.