Setting up anywhere access Certificate Problem

I did the anywhere access set up, I made a microsoft https://xxxx.remotewebaccess.com/ domain.
And after installing everything i tried to access my server true the standard windows vista Remote desktop client.

But i can't connect because the certificate isn't trusted.

Is there a simple and free way to solve this?
And can it be that this have anything to do with problems while setting up the router configuration. And that i configured the router manually.

Also i have noticed that the certificate is self signed? shouldn't the installation process provide a certificate by a trusted certificate provider?