Comment 0 for bug 1865999

Upgraded from apache2-2.4.29-1ubuntu4.11 to apache2-2.4.29-1ubuntu4.12 caused SSL Client certificate verification to stop working. Downgrading apache2, apache2-bin, apache2-data, apache2-utils back to 2.4.29-1ubuntu4.11 restored SSL Client certificate verification functionality. No configuration changes where made.

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In /etc/apache2/mods-enabled/ssl.conf:

SSLCACertificateFile "/etc/ssl/certs/ca.pem"

In /etc/apache2/sites-enabled/000-default-le-ssl.conf:
<Location "/wp-login.php">
   <If "! -R 'n.n.n.n/32'">
      SSLOptions +StdEnvVars
      SSLVerifyClient require
   </If>
</Location>

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root@www:/var/log# lsb_release -rd
Description: Ubuntu 18.04.4 LTS
Release: 18.04