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Establishment of virtual private networks (VPN)
- OpenVPN 2.0: UDP/1194 and TCP/1194.
- IPv6 Tunnel Broker Service: protocol IP 41 inbound and outbound.
- IPsec NAT-Traversal UDP/4500
- Cisco IPSec VPN over TCP: TCP/10000 outbound only.
- PPTP VPN: Protocol IP 47 (GRE) inbound and outbound.
Remote connection
- SSH: TCP/22 outbound only.
- RDP: TCP/3389 outbound only.
Web browsing
- HTTP: TCP/80 outbound only.
- HTTPS: HTTPS: TCP/443 outbound only.
E-mail
- IMAP2+4: TCP/143 outbound only.
- IMAP3: TCP/220 outbound only.
- IMAPS: TCP/993 outbound only.
- POP: TCP/110 outbound only.
- POP3S: TCP/995 outbound only.
- SMTPS: TCP/465 outbound only.
- SMTP over STARTTLS: TCP/587 outbound only
File transfer
- FTP Passive: TCP/21 outbound only.