ActiveXperts Network Monitor 2019 proactively manages network servers, devices, databases and more.

Microsoft Resource Kits - IIS 6.0 Diagnostics Toolkit

SmtpDiag - IIS 6.0 Diagnostic Toolkit Utility on Windows-Management.com

The IIS Diagnostics Toolkit is a set of tools to reduce the overall time to resolve problems with IIS (Internet Information Services) products. It is actually a combined set of popular tools used by today's IIS administrators.
SmtpDiag - SmtpDiag is an SMTP diagnostic and troubleshooting tool. SmtpDiag is a troubleshooting tool to work directly on Windows servers with IIS/SMTP service installed and running, or with Exchange Server installed, configured and running. It utilizes the same Application Programming Interface modules (APIs) as Windows and Exchange in order to diagnose configuration and connection issues involving SMTP and DNS. System RequirementsWindows 2000 or Windows Server 2003. It requires Exchange Server 2000 or Exchange Server 2003.