freebsd-update from recent 8-STABLE to 9.0-RELEASE issues

[Zane C. B-H.]

Howdy!

Any one have any idea what is going on below?

[root at shiela]/root# uname -a
FreeBSD shiela.vulpes.vvelox.net 8.3-PRERELEASE FreeBSD 8.3-PRERELEASE #0: Sat Feb 25 04:55:35 CST 2012     kitsune at shiela.vulpes.vvelox.net:/usr/obj/usr/src/sys/sheila  amd64
[root at shiela]/root# freebsd-update -r 9.0-RELEASE upgrade
Looking up update.FreeBSD.org mirrors... 3 mirrors found.
Fetching public key from update5.FreeBSD.org... failed.
Fetching public key from update4.FreeBSD.org... failed.
Fetching public key from update3.FreeBSD.org... failed.
No mirrors remaining, giving up.
Exit 1
[root at shiela]/root#