I run a web site and email server for purely personal purposes on a VPS. I created a self-signed cert for the server and installed the relevant CA cert as a profile on my iPhone as well as on desktop Firefox. This has worked fine for a long time.
Just now, connected to no event I can identify, the iPhone claims the server cert is not trusted. Upon inspecting the cert on the phone, I see that it has been issued by Fortinet rather than my self-created CA. The DNS entries are the same as are the validity dates. The key length is different (mine: 3072, theirs: 2048).
As of now, Firefox on the desktop is still working as before. The cert files on the server have not changed.
This has me a bit nervous. Can anyone shed light on what might be going on here?