Unable to access SSL/TLS Certificates domain’s option in Plesk: Could not get Mozilla TLS config

Symptoms

Unable to access SSL/TLS Certificates domain's option in Plesk with the following error:

Could not get Mozilla TLS config: cURL error 6 could not resolve host: statics.tls.security.mozilla.org; Unknown error (see https://curl.haxx.se/libcurl/c/libcurl-errors.html).

Cause

Name resolution issue.
Namely statics.tls.security.mozilla.org could not be resolved from Plesk server.

Resolution

1. Connect to the server via SSH.

2. Add Google nameserver to /etc/resolv.conf file:

   # echo "nameserver 8.8.8.8" >> /etc/resolv.conf

3. If the issue persists re-enable local firewall rules and restart Plesk services:

   # systemctl restart sw-engine && systemctl restart sw-cp-server

Note: If the server is running with systemd-resolved adjust the networking configuration manually or contact the hosting provider for assistance.