Which port for HTTP, HTTPS, SSH, SFTP, MySQL, and email.
| HTTP | 80 (TCP) |
| HTTPS | 443 (TCP) |
| SSH / SFTP | 22 (TCP) |
| FTP (avoid) | 21 (TCP) |
| FTPS | 990 (TCP) |
| MySQL | 3306 (TCP) |
| PostgreSQL | 5432 (TCP) |
| Redis | 6379 (TCP) |
| SMTP submission | 587 (TCP, STARTTLS) or 465 (TCP, SSL) |
| IMAPS | 993 (TCP, SSL) |
| POP3S | 995 (TCP, SSL) |
| DNS | 53 (UDP + TCP) |
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