Unable to open Updates & Upgrades on Plesk for Linux: ERR_CONNECTION_TIMED_OUT

kb: technical Plesk Onyx for Linux ABT: Group A

Applicable to:

Port 8447 that is used by Plesk Installer is filtered/closed with a firewall.

Open port 8447 in the firewall:

Note: if this is an Amazon installation, refer to this documentation page.

Note: if this is a Google installation, refer to this documentation page.

Opening port via Plesk

Log in to Plesk.
Go to Tools & Settings > Firewall and click the Enable button.

Note: If the Plesk Firewall component is not installed/missing, move to the command-line section.
Click the rule Plesk installer > select Allow > and click OK.
If port 8447 is still filtered/closed, check if there are any intermediate firewalls.

Contact a network administrator for further troubleshooting.

Opening port via a Command Line Interface (CLI) in Linux

Connect to the server via SSH.
Check the status of port 8447:

# iptables -nL | grep 8447
For some Linux distributions (CentOS 7, Debian, Ubuntu), additional package iptables-persistent or iptables-services is required to be installed before running iptables-save:
- For CentOS 7:
  
  # yum install iptables-services
  # systemctl enable iptables-services
- For Debian:
  
  # apt install iptables-persistent
Allow incoming connections to port 8447:
- For CentOS/RHEL-based distributions:
  
  # iptables -I INPUT 1 -p tcp --dport=8447 -j ACCEPT
  # service iptables save
- For Debian/Ubuntu-based distributions:
  
  # iptables -I INPUT 1 -p tcp --dport=8447 -j ACCEPT
  # iptables-save > /etc/iptables/rules.v4
If port 8447 is still filtered/closed, check if there are any intermediate firewalls.

Contact a network administrator for further troubleshooting.

Alternatively it is possible to use command line interface (CLI) of plesk installer: How to install / uninstall Plesk components?