TCP/IP Common Ports
When a PCAnywhere server is set up to receive remote requests,
it listens on TCP port 5631. This allow you to run a PCAnywhere
host and use the Internet to connect back and remotely control
VNC Ports 5800
VNC Is a product similar to PCAnywhere but free
AOL Instant Messenger
The newest version of AOL Instant messenger allows file transfers,
if you want to utilize this feature and have a router/firewall
you need to open port 5190.
Ports 1503 and 1720
MS NetMeeting allows you to host an Internet Video Conference
with other NetMeeting users. NetMeeting is a free product
that can be found on the Microsoft Website at
Chat (IRC) Server Port 6667 and 7000
When you run a IRC server, typically IRC Clients wanting to
connect to your server will connect on port 6667 or 7000.
One of these ports needs to be open to run your own IRC server.
IRC Chat will still show your reverse DNS name.
Lotus Notes RPC
Lotus Notes uses Port 1352 for it's Remote Procedure Call
and Notes Replication. If you want to run a Lotus Notes Server,
then Port 1352 typically needs to be open, or another port
should be defined in the Notes.ini file.
Layer (SSL) Server Port 443
When you run a secure server, SSL Clients wanting to connect
to your Secure server will connect on port 443. This port
needs to be open to run your own Secure Transaction server.
IMAP4 Server Port
IMAP4 or Internet Message Access Protocol is becoming more
popular and is used to retrieve Internet Mail from a remote
server. It is more disk intensive, since all messages are
stored on the server, but it allows for easy online, offline
and disconnected use.
LDAP Server Port
LDAP or Lightweight Directory Access Protocol is becoming
popular for Directory access, or Name, Telephone, Address
directories. For Example LDAP://LDAP.Bigfoot.Com is a LDAP
Netbios over TCP/IP
When you run Microsoft File and Print Sharing, these connections
take place over these ports 137-139. Most ISP, Cable and DSL
companies will block these ports due to security reasons.
If these Ports are open, you can usually share files and printers
over the Internet. IT
IS HIGHLY RECOMMENDED THAT YOU BLOCK THESE PORTS.
News (NNTP) Server
When you run a News server, typically News Clients wanting
to connect to your news server will connect on port 119. This
port needs to be open to run your own news server.
POP Server Port
When you run a mail server computer, users will typically
log into that machine via POP3 (Post Office Protocol) or IMAP4
(Internet Message Access Protocol) to retrieve their mail.
POP3 is the most popular protocol for accessing mailboxes.
SMTP Server Port
When someone sends a mail message to your SMTP Server, the
mail will attempt to come in to your server on Port 25. This
is the standard SMTP (Simple Mail Transport protocol) a user
types in your IP address or Host Name in their browser, the
browser will look at the IP address on port 80 for the web
Telnet Server Port
If you run a Telnet server, this port is required for the
Telnet Client to connect to your server. Telnet can be used
for other ports to check services, but in order to use telnet
for remote admin and login, port 23 must be open.
FTP Server Port
When someone attempts to connect to your FTP Server, the FTP
client will attempt the connection on Port 21 by default.
Port 21 must be open for standard FTP clients to log in and
connect to your server.
When a user types in your IP address or Host Name in their
browser, the browser will look at the IP address on port 80
by default for the web pages.
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