I've just installed FreeBSD 15.1-RELEASE but
As you can see from the above, since originally posting this I've discovered the debug option and it tells me why, so this question is solved.
freebsd-update fetch fails with:
Code:
# freebsd-update -v debug fetch
src component not installed, skipped
Looking up update.FreeBSD.org mirrors... 3 mirrors found.
Fetching public key from update2.freebsd.org... fetch: http://update2.freebsd.org/15.1-
RELEASE/amd64/pub.ssl: Network is unreachable
failed.
Fetching public key from update1.freebsd.org... fetch: http://update1.freebsd.org/15.1-
RELEASE/amd64/pub.ssl: Network is unreachable
failed.
Fetching public key from dualstack.aws.update.freebsd.org... fetch: http://dualstack.aw
s.update.freebsd.org/15.1-RELEASE/amd64/pub.ssl: Network is unreachable
failed.
No mirrors remaining, giving up.
This may be because upgrading from this platform (amd64)
or release (15.1-RELEASE) is unsupported by freebsd-update. Only
platforms with Tier 1 support can be upgraded by freebsd-update.
See https://www.freebsd.org/platforms/ for more info.
If unsupported, FreeBSD must be upgraded by source.
As you can see from the above, since originally posting this I've discovered the debug option and it tells me why, so this question is solved.