The Secure Socket Tunneling Protocol (SSTP) service could not find either a Server Authentication certificate or an Any Purpose ...

The Secure Socket Tunneling Protocol (SSTP) service could not find either a Server Authentication certificate or an Any Purpose certificate to be used for HTTPS. Check to see the availability of either a Server Authentication certificate or an Any Purpose certificate which also has a private key. SSTP sessions may not get established. Use ‘netsh.exe http add sslcert' command to configure the certificate manually or install the appropriate certificate for SSTP use and restart RemoteAccess service.