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jlauro said:

Zkuq said:

Hmm, that's interesting. I'm still getting it on the main page:

My PC's time also seems to be correct, so it's not that either... It's a Let's Encrypt certificate which says it's valid from Sep 20 until Dec 19 (i.e. when I reported the problem). I can provide more details about the certificate if necessary, but I'm getting the same issue in both Chrome and Firefox, so there's definitely something wrong with the certificate.

tl;dr: Reboot (cold restart, not just sleep) your machine and that should flush all caches and fix it.

Longer answer: Can you tell what IP your machine is connecting to?  (You can try "netstat -an" at a shell/command prompt in most OS right after loading a page).  It should show  If it doesn't, but shows (the old server that is proxying connections to the new server) then that is the problem.  If you haven't restarted your browser in a few weeks, it might be holding onto the old ip.

Try ping and see which IP it is using.  If the old IP, try flushing your dns cache (different depending on OS).  Most browsers cache DNS outside of the OS, so you can't assume the browser is using the same IP and ping if it's been running awhile.

That was... unexpected. I got the issue fixed, but your instructions were not quite enough. netstat -an was indeed showing the old IP address for However, even after restarting my PC and flushing the DNS cache manually, it was still showing the old IP address. ping was showing the new IP address, but ping was showing the new IP address. For a while, I wondered if some DNS server might still be giving out the old IP address, but it seemed unlikely. I finally rebooted my router, and it seems fine now. I guess my router must have had some caching as well... (I also flushed by browser's DNS cache after rebooting my browser since it seemed to have one, but since it works in two different browsers now, it must've been the router instead.)

Anyway, thanks! Your help certainly seems to have pointed my in the right direction in what seemed like a fairly bizarre case to me. :)