Either you have a valid cert, or you need to manually install the cert, or you're clicking through a scary warning (every time you start a fresh browser session

Either you have a valid cert, or you need to manually install the cert, or you're clicking through a scary warning (every time you start a fresh browser session, I think). For a normal user, the procedure for manually installing a certificate is "put the router back in the box, return it to the store, and buy a different brand".