Ports are software gateways that require cPanel servers to function properly to be open by the firewall.
- 20 — FTP TCP inbound/outbound
- 21 — FTP TCP, UDP inbound/outbound
- 22 — SSH TCP inbound
- 25 — SMTP TCP inbound/outbound
- 26 — SMTP TCP inbound/outbound
- 37 — rdate TCP outbound
- 43 — whois TCP outbound
- 53 — DNS TCP/UDP inbound/outbound (inbound is only needed if you run your own public DNS server)
- 80 — HTTP TCP inbound/outbound
- 110 — POP3 TCP inbound
- 113 — ident TCP outbound
- 143 — IMAP4 TCP inbound
- 443 — HTTPS TCP inbound
- 465 — SMTP TLS/SSL TCP/UDP inbound/outbound
- 783 — SpamAssassin TCP/UDP inbound
- 873 — rsync TCP/UDP outbound
- 993 — IMAP4 SSL TCP inbound
- 995 — POP3 SSL TCP inbound
- 2077 — WebDAV TCP/UDP inbound/outbound
- 2078 — WebDAV SSL TCP/UDP inbound/outbound
- 2082 — cPanel TCP inbound
- 2083 — cPanel SSL TCP inbound
- 2086 — WHM TCP inbound
- 2087 — WHM SSL TCP inbound
- 2089 — cPanel license TCP outbound
- 2095 — Webmail TCP inbound
- 2096 — Webmail SSL TCP inbound
- 3306 — MySQL TCP (only if you need to connect remotely)
- 6666 — Chat TCP inbound
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