Yum Error

[Joel Gomberg]

I've been getting the following error when running yum update today:

Could not get metalink 
https://mirrors.fedoraproject.org/metalink?repo=updates-released-f16&arch=x86_64 
error was
14: Peer cert cannot be verified or peer cert invalid
Could not get metalink 
https://mirrors.fedoraproject.org/metalink?repo=updates-testing-f16&arch=x86_64 
error was
14: Peer cert cannot be verified or peer cert invalid

Can someone explain these messages or, better yet, tell me what to do about them?

-- 
Joel