New answers tagged


Running update-ca-certificates is not covered by rebooting your linux machine. It's usually automatically run when other software packages install new certificates to the cert store. But, again, not at reboot time.


Thank you @Tokk for the answer. For Ubuntu 20.04, I modified /etc/apache2/mods-available/ssl.conf as follows: # SSLSessionCache shmcb:${APACHE_RUN_DIR}/ssl_scache(512000) SSLSessionCache shmcb:${APACHE_RUN_DIR}/ssl_scache(10000000) Then typing sudo service apache2 restart solved the issue!


It turns out that the root certificates were out of date, as suggested by the comments. I downloaded the Windows update "Support for urgent Trusted Root updates for Windows Root Certificate Program in Windows" directly from the Microsoft site, which fixed the problem.

Top 50 recent answers are included