Unable to connect to a Plesk server via FTP when FTP ports are filtered by a firewall: Connection timed out

Enable Plesk Firewall to open these ports locally on the server.

1. Connect to the Plesk server via SSH.

2. Install the optional package for managing iptables:

   • for CentOS/RHEL-based distributions:

     # yum install -y iptables-services
     # systemctl enable iptables-services

   • for Debian/Ubuntu-based distributions:

     # apt install -y iptables-persistent

3. Allow incoming connections to the ports 20 and 21:

   • for CentOS/RHEL-based distributions:

     # iptables -I INPUT 1 -p tcp --dport=20 -j ACCEPT
     # iptables -I INPUT 1 -p tcp --dport=21 -j ACCEPT
     # service iptables save

   • for Debian/Ubuntu-based distributions:

     # iptables -I INPUT 1 -p tcp --dport=20 -j ACCEPT
     # iptables -I INPUT 1 -p tcp --dport=21 -j ACCEPT
     # iptables-save > /etc/iptables/rules.v4

1. Connect to a Plesk server via RDP.

2. Open Windows Firewall in Control Panel.

3. In Windows Firewall, click Advanced settings > Inbound Rules.

4. Make sure the following FTP rules are enabled.