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Beginners Guides: Firewalls and Internet Security

Beginners Guides: Firewalls and Internet Security - PCSTATS
Abstract: Securing your computer against threats from the Internet is an essential step. If you do not, you will, at some point, regret it. Guaranteed.
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Filed under: Beginners Guides Published:  Author: 
External Mfg. Website: PCSTATS Jul 30 2007   Mike Dowler  
Home > Reviews > Beginners Guides > PCSTATS

Common Port Numbers

Client filters require the IP address of a computer or computers in your internal network, and the ports which will be blocked, with the protocol type (TCP or UDP).

Hopefully, the whole concept of firewalls and Internet security is a little clearer now. Antivirus programs are essential, and you really should have a home firewall to properly protect your computer or network.

Again, keep in mind that for typical use, a software or hardware firewall should require little or no configuration, so don't be intimidated. The configuration itself revolves around a very limited set of changes, as I hope this article has shown. Protect yourself.

PCSTATS

Here is a list of well-known port numbers which you may find useful in configuring your firewall.

ServicePort Number
FTP 21TCP
Telnet 23 TCP
SMTP 25 TCP
HTTP 80 TCP
POP3 110 TCP
HTTPS (secure) 443 TCP
IRC 194 TCP
ICQ 5190 TCP, (note: ICQ by default will use this port to connect, and any available port above 1024 to listen for new connections. This is kind of insecure, so I would recommend going to the ICQ site and reading their firewall configuration info
AOL messenger 5190, 4099 TCP (also will self configure to available ports)
Yahoo IM (self configures)
MSN messenger 6891-6900 TCP for file transfer, 6901 TCP/UDP for voice (otherwise self configures messaging)
Kazaa 1214 TCP (can be reconfigured within Kazaa)
Games** For various multiplayer games, check the websites for specifics.

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Contents of Article: PCSTATS
 Pg 1.  Beginners Guides: Firewalls and Internet Security
 Pg 2.  Some General Firewall Tips
 Pg 3.  Dealing with Anti-virus Software
 Pg 4.  Firewalls and Internet Security
 Pg 5.  Circuit Level Gateways
 Pg 6.  Stateful Inspection
 Pg 7.  Configuring the Windows XP Firewall
 Pg 8.  Configuring Firewall Services and Exceptions
 Pg 9.  Creating Exceptions with the Service Pack 2 XP Firewall
 Pg 10.  Client Filtering and Reverse Firewalls
 Pg 11.  — Common Port Numbers

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