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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.


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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!


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It turns out that the root certificates were out of date, as suggested by the comments.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.


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