No FreeBSD upgrade from 9.2 to 10.0 via freebsd-update?

[Kurt Buff]

Running into a roadblock. Below is the interaction - is there a cure?
Trying with '-s updaten.freebsd.org', where n=1-6 failed to contact 1,
and 2-6 got the message below.

Kurt

root at mon:/usr/ports/ports-mgmt/pkg # freebsd-update upgrade -r 10.0-RELEASE
Looking up update.FreeBSD.org mirrors... 5 mirrors found.
Fetching metadata signature for 9.2-RELEASE from update6.freebsd.org... done.
Fetching metadata index... done.
Inspecting system... done.

The following components of FreeBSD seem to be installed:
kernel/generic world/base world/games world/lib32

The following components of FreeBSD do not seem to be installed:
src/src world/doc

Does this look reasonable (y/n)? y

Fetching metadata signature for 10.0-RELEASE from update6.freebsd.org... done.
Fetching metadata index... done.

The update metadata is correctly signed, but
failed an integrity check.
Cowardly refusing to proceed any further.