On servers protected by a firewall, the following ports must not be
blocked to ensure proper operation of Plesk and accessibility of
Plesk-managed 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 and Plesk Updater | TCP 80, TCP 443 |
| FTP server | TCP 20, 21, 990 |
| 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 |
| Tomcat Java service | TCP 9080, 9008 |
| Licensing Server connections | TCP 443 |
| Domain name server | UDP 53, TCP 53 |
| Plesk upgrades and updates | TCP 8447 |
Warning: If you use Presence Builder, do not block inbound connections to port
8880, otherwise Presence Builder will not function.