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Cisco IOS Commands
An Introduction to Computer Security
Pix Configuration Guide
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Remote Desktop Connection
Windows Processes That May Be Dangerous
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Common Linux Commands
Common Ports
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HTTP Response Codes
War-Google Hack Terms
Wardriving
Avoiding Social Engineering and Phishing Attacks
Intrusion Detection on Linux
Linux Intrusion Detection
Penetration Testing Guide
Penetration Testing Tools
Social Engineering Fundamentals, Part I: Hacker Tactics
Social engineering (computer security)
The Psychology of Social Engineering

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Common Ports

The following is a list of common ports for the many network services that are available. These are registered service ports, this does not mean that a service can not be run on this port other wise.

Service Port(s)
Echo 7
Daytime 13
qotd (Quote Of The Day) 17
FTP-data 20
FTP 21
SSH 22
Telnet 23
SMTP (Simple Mail Transfer Protocol) 25
Time server 37
Whois 43
DNS (Domain Name System) 53
TFTP (Trivial File Transfer Protocol) 69
Finger 79
HTTP (Hypertext Transfer Protocol) 80
POP2 (Post Office Protocol 2) 109
POP3 (Post Office Protocol 3) 110
Portmapper 111
Ident 113
NNTP (Network News Transfer Protocol) 119
NTP (Network Time Protocol) 123
Samba 137-139
IMAP2 (Internet Message Access Protocol) 143
SNMP (Simple Network Management Protocol) 161
BGP (Border Gateway Protocol) 179
IMAP3 (Internet Message Access Protocol) 220
LDAP (Lightweight Directory Access Protocol) 389
HTTPS (Secure Hypertext Transfer Protocol) 443
rlogin 513
rsh 514
Line printer (lpr) spooler 515
Talk 517
Time server 525
NNTPS (Secure Network News Transfer Protocol) 563
IPP (Internet Printing Protocol) 631
LDAPS (Secure Lightweight Directory Access Protocol) 636
IMAPS (Secure Internet Message Access Protocol) 993
POP3S (Secure Post Office Protocol) 995
NFS (Network File System) 2049
MySQL 3306
VNC (Virtual Network Computing) 5800+ 5900+
X11 6000-6063
XFS (X Font Server) 7100