Just was it says on the tin, I logged into my Untangle this morning. This is the v12 I installed yesterday. It said updates were available, so I clicked upgrade. The upgrade completed! I see no issues.

Except when connecting to the system via HTTPs I get firefox whining about HSTS. So I go and look, and sure enough Apache is responding with a self signed certificate. I looked at the contents of /etc/apache2/ssl and apache.pem was overwritten, file modification date approximating when I pushed the update button.

Now I went to config -> administration -> certificates and clicked import signed server certificate and fed it a backed up copy of apache.pem and I'm off to the races again. My question is... why did it get reset?