freebsd-update the src ?

After using the new portsnap utility for a while with great success,  
i tried to update the (current) src tree with the
also new freebsd-update utility, but  all i got (tried several times  
within several weeks) is:

# freebsd-update fetch
Looking up update.FreeBSD.org mirrors... 1 mirrors found.
Fetching public key from update1.FreeBSD.org... failed.
No mirrors remaining, giving up.


Did i miss something or isn't it just ready for use ?
Thanx in advance for any insight.

Regards

-- 
Henry Vogt <hv_at_tuebingen.mpg.de>  (Phone: ++49-7071-601-511)
Campus Max-Planck-Institutes, Spemannstr. 32-39, Tübingen, Germany