The other problem also comes up when I run qubes-dom0-update.
Qubes is still downloading updated for Fedora 23 when I've had Fedora 24 for months.
I don't have the Fedora 23 template anywhere on the machine (that I know of).
To clarify what I mean, it is NOT installing updates for Fedora 24 (which I am using), it is looking for updates for Fedora 23.
I've had many problems since installing the Fedora 24 template but I just noticed this one.
I have had timesync fail when port 123 (fedora also use another one I forget) being blocked in router or somewhere.
How do you know it is looking for Fedora 23 update? How are you updating, what messages are you seeing?
actually that other port that fedora opens is probably a bug like their bugged dhclient. only allow 123 in your router.