A question was presented to me today regarding authentication methods for Windows 2000 servers(and *nix ones) across the Internet so only one login is necessary. While I think there are a few fielded answers, finding one to implement that is secure is not necessarily easy. RADIUS was proposed but Windows 2000 I am not sure supports it. I have found it can run a server for that auth. method so when I do further research maybe it will be viable. Another possible type is LDAP. The problem with LDAP is that from what I have been looking at, you have to rig Windows a bit differently to auth. on it but might be worth a shot if done through SSL or some other secure method. Kerberos might show some promise. It looks like no easy way exists but I do not plan to give up that easily.
More on this later…maybe…