I had a failed attempt to upgrade to 0.49, so rolled back both my database server and metabase server to a backup from last night.
Now, the site never completes startup. If I run from command line, I see no errors but it stops at:
You couldn't make this stuff up - my Azure subscription has gone haywire and I can no longer create resources! I've emailed MS, so hopefully resolved soon.
Kicking myself. The Metabase server didn't have a fixed IP address. It's never changed while rebooting in the past, but has done now.
I've changed the Azure firewall and the MySql account. all working now.