Creating a self-signed cert for localhost

Windows

First use the command in PowerShell as administrator:

New-SelfSignedCertificate -DnsName "localhost" -CertStoreLocation "cert:\LocalMachine\My"

Then go to:

File -> Add or Remove Snap-ins -> Certificates -> Add -> Computer account -> Local computer. Click Finish.

Expand the Personal folder and you will see your localhost certificate:

Copy the certificate into Trusted Root Certification Authorities - Certificates folder.