Symptoms
When accessing Plesk on ports 8443/8880 in a web-browser, the page fails to load with one of the following errors:
This site can’t be reached
server.example.com took too long to respond.
ERR_CONNECTION_TIMED_OUT
The connection has timed out
Cause
Plesk ports 8443/8880 are filtered by a firewall.
Resolution
1. Opening ports 8443/8880 in a local firewall
Plesk ports may be filtered by a local firewall installed on the system.
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Connect to the Plesk server via SSH.
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Check the status of port 8443:
# iptables -nL | grep 8443
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For some Linux distributions (CentOS 7, Debian, Ubuntu), additional package "iptables-persistent" / "iptables-services" is required to be installed before running "iptables-save":
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on CentOS/RHEL-based distributions
# yum install -y iptables-services
# systemctl enable iptables-services -
on Debian/Ubuntu-based distributions
# apt install -y iptables-persistent
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Allow incoming connections to port 8443/8880:
# iptables -I INPUT 1 -p tcp --dport=8443 -j ACCEPT
# iptables -I INPUT 1 -p tcp --dport=8880 -j ACCEPT-
for OSes with firewalld enabled, run these commands:
# firewall-cmd --permanent --add-port=8443/tcp
# firewall-cmd --permanent --add-port=8880/tcp
# firewall-cmd --reload
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During Plesk installation on Windows Server, Plesk Installer automatically adds rules to Windows Firewall. To check if the rule is there, follow these steps:
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Connect to the Plesk server via RDP.
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Click Windows Start and type Windows Firewall with Advanced Security.
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Look for the rule names Plesk and Plesk Newsfeed in Inbound Rules.
Click on the picture to enlarge
If the rules are missing, add them:
3.1. Click New Rule... in the Inbound Rules menu.
3.2. Select "Port" and click Next.
3.3. Type 8443 and click Next.
3.3. Select "Allow the connection" and click Next.
3.3. Select all profiles and click Next.
3.4. Name the rule "Plesk" and click Finish.
Note: If a 3rd-party firewall/router is configured between your Plesk server and the Internet, open ports 8443/8880 there as well.
2. Opening ports 8443/8880 in a cloud computing service firewall
If Plesk is installed on a cloud computing service, follow the instructions for your cloud computing service to open ports 8443/8880:
3. Opening ports 8443/8880 on hosting/Internet service provider side
If after applying the above steps Plesk ports 8443/8880 are still shown as filtered (closed) by an online port checker (for example, ping.eu), that means that these ports are filtered on a hosting/Internet service provider side. Please, contact your hosting/Internet service provider and ask them to open these ports for you.