Issue
When trying to connect to the Plesk Server Administrator you receive a connection failed or timeout error.
Solution
When the Plesk Administrator login page is not accessible and port 8443 is unreachable, the issue is almost always related to the Plesk service state, firewall rules, or a broken SSL/Plesk component. You would need to check to make sure the port 8443 is accessible through the firewall. The Plesk Server Administrator listens for SSL connections on port 8443, because this is not a standard web service port some firewalls may block access. Also, check your computers software firewall and any hardware firewall or security appliances which may sit in front of your computer. Below are the most common fixes for most common OS. You may have to check the documentation for your existing OS on firewall updates.
Port 8443/TCP must be open.
Linux (firewalld)
firewall-cmd --list-ports
If missing:
firewall-cmd --add-port=8443/tcp --permanent firewall-cmd --reload
Linux (iptables)
iptables -L -n
If blocked, allow port 8443.
iptables -A INPUT -p tcp --dport 8443 -j ACCEPT service iptables save
Windows Firewall
- Open Windows Defender Firewall
- Confirm an inbound rule exists:
- TCP port 8443
- Add the rule if missing.
IMPORTANT: These are general guidelines and may not apply to your operating system. If the above information is not applicable, please refer to your OS documentation.
Get in touch
For any additional help, give us a call on 0800 477 333 (8AM to 10PM, 7 days a week).