P-660R-Tx Series Support Note s
Default port numbers for some services
Service
Port Number
FTP
21
SSH
22
Telnet
23
SMTP
25
DNS (Domain Name Server)
53
www-http (Web)
80
POP3
110
HTTPs
443
PPTP
1723
VNC
5900
T.120
1503
H.232
1720
Configure a PPTP server behind SUA
Introduction
PPTP is a tunneling protocol defined by the PPTP forum that allows PPP
packets to be encapsulated within Internet Protocol (IP) packets and
forwarded over any IP network, including the Internet itself.
In order to run the Windows 9x PPTP client, you must be able to establish an IP
connection with a tunnel server such as the Windows NT Server 4.0 Remote
Access Server.
Windows Dial-Up Networking uses the Internet standard Point-to-Point (PPP) to
provide a secure, optimized multiple-protocol network connection over dial-up
telephone lines. All data sent over this connection can be encrypted and
compressed, and multiple network level protocols (TCP/IP, NetBEUI and
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