| DNS | UDP/TCP 53 | DNSSEC | UDP/TCP 53 | |
| FTP | TCP 21 (and 20) | FTPS | TCP 21 (explicit mode) / TCP 990 (implicit mode) | Using TLS |
| FTP | TCP 21 (and 20) | SFTP | TCP 22 (SSH) | Using SSH |
| HTTP | TCP 80 | HTTPS | TCP 443 | Using TLS |
| IMAP | TCP 143 | IMAPS | TCP 993 | Using TLS, Fetching emails from server, stay in sync. |
| LDAP | UDP/TCP 389 | LDAPS | TCP 636 | Using TLS |
| POP3 | TCP 110 | POPS | TCP 995 — Secure POP3 | Using TLS, Fetching emails and delete on server |
| RTP | UDP 16384–32767 | SRTP | UDP 5004 | Real Time Protocol |
| SNMP | UDP 161 and 162 | SNMPv3 | UDP 161 and 162 | Simple Network Management Protocol |
| Telnet | TCP 23 | SSH | TCP 22 | Remote Access |
| SMPT | TCP 25 | SMTPS over TLS | TCP 465 | Sending of emails |