update.FreeBSD.org / No mirrors remaining, giving up

[Zbigniew Szalbot]

Hello,

I am not sure why but whenever I do:

$ freebsd-update fetch
Fetching metadata signature for 7.0-RELEASE from update.FreeBSD.org... failed.
No mirrors remaining, giving up.

but if type:
$ portsnap fetch
Fetching snapshot tag from portsnap.FreeBSD.org... done.

Many thanks for any hint as to what may be wrong with
update.FreeBSD.org on this machine!

-- 
Zbigniew Szalbot