I have the below cron entry on my remote linux server (CentOS Linux release 7.5.1804 (Core)) with restricted firewall rules.
0 2 1 * * /usr/bin/certbot renew --quiet --renew-hook “/usr/bin/gitlab-ctl restart nginx”
when i invoke the above cron entry it fails and looks like firewall restricts the incoming requests from remote letsencrypt validation servers. Do i need to IP whitelist letsencrypt validation servers and if it is the case what IP’s i need to allow?
Any help will be highly appreciable. Thanks in Advance.