Plesk is middleware between end users and external services such as FTP,
mail, DNS and others. Due to technical limitations, Plesk is able to
interact with these services only if they are available on certain
ports.
The list below provides information about services managed through Plesk
and about ports on which they should be available for proper interaction
with Plesk. If you use a firewall, make sure that the connections to all
of these ports are allowed for corresponding Plesk services.
| 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 |
| POP3 (mail retrieval) server | TCP 110, TCP 995 |
| IMAP (mail retrieval) server | TCP 143, TCP 993 |
| MySQL server | TCP 3306 |
| MS SQL server | TCP 1433 |
| PostgreSQL server | TCP 5432 |
| Licensing Server connections | TCP 443 |
| Domain name server | UDP 53, TCP 53 |
| Plesk upgrades and 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.