Fix SSL Error on IIS

I need help fixing an SSL error on my IIS server. Currently, when I try to access my website via HTTPS, it doesn't load and shows a "Secure connection failed" or an SSL handshake error. Also, server is behind a cable router with the definition for port forwarding... (Budget: $30 - $250 USD, Jobs: IIS, Linux, Network Administration, Network Security, Server, SSL, System Admin, Troubleshooting, Web Security, Windows Server)