There was a routine SSL certificate renewal. Vendor sends us a CSR. We send the certificate. They applied the certificate. Naturally, wanting to make sure the issue was resolved, I tried to go to the website and check the certificate was in fact updated.
I clicked on the link to the website and got nothing. I ran curl -v on the URL and got the website is unavailable. I checked IsItDown RightNow? Yup, it was definitely down. I reported it to the vendor.
They were confused. So was my client.
I had forgotten that access to that service is limited to IP addresses in a specific building by the vendor. I and the things I use don’t have access.