| 20 | in / out | FTP data transfer | 
| 21 | in / out | FTP control | 
| 22 | in / out | Secure shell (SSH) | 
| 25 | in / out | Simple mail transfer protocol (SMTP) | 
| 53 | in / out | Domain name system (DNS) | 
| 80 | in / out | Hypertext transfer protocol (HTTP) | 
| 110 | in / out | Post office protocol v3 (POP3) | 
| 113 | out | Authentication service/identification protocol (IDENT) | 
| 143 | in / out | Internet message access protocol (IMAP) | 
| 443 | in / out | Hypertext transfer protocol over SSL/TLS (HTTPS) | 
| 465 | in / out | Simple mail transfer protocol overl SSL (SMTPS) | 
| 587 | in / out | E-mail message submission (SMTP) | 
| 993 | in / out | Internet message access protocol over SSL (IMAPS) | 
| 995 | in / out | Post office protocol 3 over TLS/SSL (POP3S) | 
| 2703 | out | Spamassassin Razor2 | 
| 5224 | out | Plesk license check | 
| 8443 | in / out | Plesk administrative interface (HTTPS) | 
| 8447 | in / out | Parallels Products Installer | 
| 8880 | in / out | Plesk administrative interface (HTTP) | 
| 30000:35000 | in | FTP passive port range (When configured) |