If you are experiencing troubles with server communication, and have Icewarp installed on RedHat / CentOS server, check the following:
- iptables – check what rules are applied via the iptables -L command.
- postfix – check if Postfix Mail Transfer Agent is present via postconf mail_version command. The agent can block SMTP port 25. Uninstall Postfix with the yum remove postfix command.
- firewalld – check if the firewall is enabled via the systemctl status firewalld command. Uninstall it with the yum remove firewalld command.
- nginx – check if the Nginx server is present via the nginx command. Uninstall it with the yum remove nginx command.
- apache – check if the Apache server is not blocking port 80 via the lsof -nPi | grep ":80 (LISTEN)" command. Uninstall the server with the yum erase httpd httpd-tools apr apr-util and userdel -r "apache" commands.
- SELinux – check if SELinux is disabled by looking into its config: vi /etc/selinux/config. If it is enabled, rewrite it to „disabled“.
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