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Knowledge Base

Plesk for Linux and firewalld Compatibility

 
deployment guidereferencecentoscentos 7cloudlinux

firewalld is a firewall
management tool for Linux operating systems. This section explains how
you can use it to open the ports necessary for Plesk to operate.

For Plesk and its services to work properly, a number of ports must be
open on the server. On some operating systems, these ports can be closed
by default. When you install Plesk, if firewalld is installed on the
server, Plesk automatically opens the ports required for Plesk to
operate. This mechanism works even if firewalld is turned off during the
Plesk installation.

firewalld is supported on the following operating systems:

  • CentOS 7, RHEL 7, CloudLinux 7
  • Ubuntu 16.04 and higher.

On CentOS and RHEL versions 7 and later, firewalld is installed and runs
by default. On Ubuntu 16.04 and later, you need to turn on firewalld
manually after installing Plesk.

Known Issues and Limitations

  • Plesk can only configure firewalld version 0.4 or later.
  • Plesk can only configure firewalld during Plesk installation. When
    you upgrade Plesk, the firewalld configuration does not change.

You can see the list of ports and associated protocols Plesk opens via
firewalld in the table below:

Service name Ports used by service
Administrative interface of Plesk over HTTPS TCP 8443
Administrative interface of Plesk over HTTP TCP 8880
Web server TCP 80, TCP 443
FTP server TCP 21
SSH (secure shell) server TCP 22
SMTP (mail sending) server TCP 25, TCP 465, TCP 587
POP3 (mail retrieval) server TCP 110, TCP 995
IMAP (mail retrieval) server TCP 143, TCP 993
Domain name server UDP 53, TCP 53
Plesk upgrades and updates TCP 8447

Plesk applies the configuration above to the firewalld zone called
“plesk” and sets that zone as the default one. Runtime firewalld
rules

added before installing Plesk are lost. Permanent
rules

are not affected. You can roll them back at anytime.

Rolling Back the Initial firewalld Configuration

If you configured permanent firewalld
rules

before installing Plesk by adding…

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