==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version: 1.3.1 MARIADB edition.
- Install with bash iRedMail.sh comes with "git clone https://github.com/iredmail/iRedMail.git"
- Linux/BSD distribution name and version: Ubuntu 20.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
====

After installing all necessary scripts, and just before adding the firewall rules, my ssh connection got disconnected.

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* iRedMail-1.3.1 installation and configuration complete.
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< Question > Would you like to use firewall rules provided by iRedMail?
< Question > File: /etc/default/iptables, with SSHD ports: 22. [Y|n]client_loop: send disconnect: Connection reset by peer

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Now, I need to know, how can I manually add the FireWall Rules for iRedMail?

Thank you.