# Ports Used by Plesk

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/MariaDB 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