summary: For Plesk and its services to work correctly, certain ports must not be blocked.

In this topic, you will learn what ports must be kept open on Plesk servers.

The following is a list of ports and protocols used by Plesk services.

Service name Ports used by service
Administrative interface of Plesk over HTTPS TCP 8443, UDP 8443
Administrative interface of Plesk over HTTP TCP 8880
Web server TCP 80, TCP 443, UDP 443
FTP server TCP 21
SSH (secure shell) server TCP 22
SMTP (mail sending) server TCP 25, TCP 465
POP3 (mail retrieval) server TCP 110, TCP 995
IMAP (mail retrieval) server TCP 143, TCP 993
MySQL/MariaDB server TCP 3306
Microsoft SQL Server TCP 1433
PostgreSQL server TCP 5432
Licensing Server connections TCP 443
Domain name server UDP 53, TCP 53
Plesk Installer, Plesk updates TCP 8447

Note: If you install Presence Builder as part of Plesk, Presence Builder uses the same protocol and opens on the same port as the Plesk UI.