At ${PREVIOUS_JOB}, I despised that certificate caching behavior. It did nothing but wallpaper over configuration errors that shouldn't be wallpapered over...
Me: "Your site at https://blah.otherdept.myemployer.edu/ is causing visitors to see SSL errors because your web server isn't sending the certificate chain. It probably got messed up when an updated certificate was installed the other day."
Other sysadmin: "It works fine for me. Try clearing your browser's cache."
Me: "No, really, it's not that. Here's the openssl s_client output showing that your server is only sending its own certificate and not any intermediate certificates."
Other sysadmin: "I just tried from another computer in the office, and the site's working fine. You should call the university's helpdesk since the problem is obviously on your end."
Me: "Your site at https://blah.otherdept.myemployer.edu/ is causing visitors to see SSL errors because your web server isn't sending the certificate chain. It probably got messed up when an updated certificate was installed the other day."
Other sysadmin: "It works fine for me. Try clearing your browser's cache."
Me: "No, really, it's not that. Here's the openssl s_client output showing that your server is only sending its own certificate and not any intermediate certificates."
Other sysadmin: "I just tried from another computer in the office, and the site's working fine. You should call the university's helpdesk since the problem is obviously on your end."
Me: profanity