CRD uses Google services to mediate between the client and host. Unfortunately, there's no way to bypass the authentication step without also getting rid of that mediation. In principle, you could establish a CRD connection by entering an IP address, but it would be a substantial amount of work to implement it and there are a number of free remote access products that already let you do that. If they aren't suitable for your use-case, please give us more details on what you're trying to do, and I might be able to advise further.