operating system is (include version): N/A (just used for O365)
web server is (include version): Don’t know
hosting provider, if applicable, is:123-Reg
I can login to a root shell on my machine (yes or no, or I don’t know):Don’t know
I’m using a control panel to manage my site (no, or provide the name andversion of the control panel):Yes, on 123-Reg
From a quick look, you have had just one SSL cert, although obtained fairly early in the morning for UK 2016-09-10 04:51:10 GMT - You say “We inherited the IT support a couple of years ago and no-one knows who originally setup the SSL” - does this give any clues ( as it was only 3 months ago).
If not, then we can talk you through obtaining a new certificate which you can upload.
Very strange as none of us in IT have ever requested an SSL for this domain - we don’t actually need it as O365 provides its own one, but now we have an expired one, it’s displaying errors.
Can we remove it completely so it doesn’t come up as expired?
Alternatively, please talk me through obtaining a new one which we can upload?