Self-Signed Certificates on IIS 7 – the Easy Way and the Most Effective Way | Demystifying The Code

Self-Signed Certificates on IIS 7 – the Easy Way and the Most Effective Way

As per Olav’s blog, run SelfSSL /N:CN=<your web site address (no http://)> /V:<how many days the certificate should be valid> /S:<site ID from above> [/P:<port, if not 443>]
For me it was: SelfSSL /N:CN=www.testssl.com /V:1000 /S:2