Plus: Cafesoft ships Apache single sign-on tool.NetPro Computing last week released Version 3.0 of its DirectoryLockdown tool for Microsoft's Active Directory. The tool monitors the Configuration and Schema Naming Contexts in the directory and prevents unauthorized changes. This can protect companies against denial-of-service attacks, security breaches and service interruptions.Companies can set the software to shut down the directory if a breach is detected or to send an alert to an administrator. NetPro also includes a module so the tool can plug into Microsoft Operations Manager, a network-monitoring tool.The software supports Windows 2000 and 2003. Pricing starts at $9 per user.Caf\u00e9soft has shipped Cams Apache 2.0, which supports single sign-on security across Apache 2.0 Web servers. The software works with a farm of Apache servers or between Apache 2.0 and other Web and Java 2 Platform Enterprise Edition-based servers.Cams works with Lightweight Directory Access Protocol v3-compliant directory servers and SQL databases. The software features role-based access control, centralized security policy administration and logging capabilities. Pricing starts at roughly $3,000 per server.