Why are the DynDNS.com accounts and DynDNS.com Community accounts not linked together?
We wanted to provide users as many options as possible for how they use their accounts. If you want to use your DynDNS.com username and password to access the forum, you can; simply choose the DynDNS.com OpenID icon when you sign up for the community. If you want them to be different, use an external OpenID provider (such as Google or Yahoo).