9.715, fw-notify.net not reachable after regenerating signing CA cert

Running 9.715

My HTTPS signing CA cert was due to expire in the next 30 days so I regenerated the cert: Web Protection / Filtering Options / HTTPS CAs / Regenerate

After doing this internal hosts were not able to retrieve the new cert from http://passthrough.fw-notify.net/cacert.pem, connections time out

I have done the following but nothing resolves the issue:

1) Uploaded the original cert to the UTM

2) Didn't find any clues in the logs

3) Regenerated another new cert

4) Rebooted

5) Waited overnight for some magic to happen... ;-}

At this point I'm stumped and am looking for help to resolve this.