Services

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.