How to Renew Mailcow SSL Certificate?

Leave a Comment / Blog /

ACME-Mailcow acme-mailcow is a bulit-in add on to issue, renew/update certificates for the domain. Autodiscover and autoconfig sharing the same SSL certificate are created for MS outlook. 1. Restart acme-mailcow client: docker-compose restart acme-mailcow 2. Check expiry date: bash /opt/mailcow-dockerized/helper-scripts/expiry-dates.sh 3. Renew by force: touch /opt/mailcow-dockerized/data/assets/ssl/force_renew; docker-compose restart acme-mailcow 4. Monitor acme activity: docker-compose logs […]

How to Renew Mailcow SSL Certificate? Read More »

About Fail2ban Failed Running On Fresh Debian 12

Leave a Comment / Blog /

Background I switched server OS from Uuntu 24.04 to Debian 12 bookworm. After updates, among priorities, I installed fail2ban utility to prevent sshd attack. It turned out a failed process.  At the /etc/fail2ban directory, a copy of fail.conf was made fail.local, a traditional practice. Fail2ban showed an error exit code: root@xxxxxxxxx:/etc/fail2ban# systemctl restart fail2banroot@xxxxxxxxx:/etc/fail2ban# systemctl

About Fail2ban Failed Running On Fresh Debian 12 Read More »

How to apply for a free wildcard SSL certificate with cloudflare API on Ubuntu

Leave a Comment / Blog /

Background 1) plaintext transmission is no longer acceptable. For example, you can not open a website prefixed http.2) Self-signed is not suitable for public demonstration, though 10-year term, and not well recognized by web browsers, too.3) Cyber security should be enhanced is the best practice when you are exposed on the interne. Why wildcard certificates

How to apply for a free wildcard SSL certificate with cloudflare API on Ubuntu Read More »

Scroll to Top