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Port 515

Posted on 2003-12-11
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Can someone please tell me how can I verify if an ports is already open( ex. 515), from an workstation.
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Question by:elegal
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Pete Long earned 100 total points
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Hi elegal,
Finding out what Ports are open

TO find out what ports are open/exposed do the following

Start >Run >type "cmd" {enter}
At the command line type "netstat -a" {enter}

The list displayed shows "Listening ports" and established "Who is on the other end" connections to yout computer.

WARNING
This is a list of common Trojan/Backdoor Port numbers
http://www.sans.org/resources/idfaq/oddports.php


Who is listening? Use this syntax: netstat -an |find /i "listening"
Save who is listening to a text file: netstat -an |find /i "listening" > c:\openports.txt
Who is established? Use this syntax: netstat -an |find /i "established"


Note: In Windows XP, you can type NETSTAT -O to get a list of all the owning process ID associated with each connection: netstat -ao |find /i "listening"


*****Pulist*****

You can use PULIST from the W2K Resource Kit to find the PID and see what process uses it and who started it. For example, you found out that your computer had an open connection to a remote IP address on TCP port 80, and you don't have any Internet Explorer or other browser windows open. You want to find out what process is using that session.
Download: http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/pulist-o.asp


*****Links*****

Port Assignments for Commonly-Used Services
http://www.microsoft.com/windows2000/techinfo/reskit/samplechapters/cnfc/cnfc_por_simw.asp

TCP/UDP Ports Used By Exchange 2000 Server
http://support.microsoft.com/default.aspx?scid=kb;en-us;278339

Nice shiny Port List :0)
http://hackerwhacker.com/portslist.html

http://www.incubus.co.uk/os/windows/netstat.htm
http://www.petri.co.il/quickly_find_local_open_ports.htm

*****Portscan Software*****

Scan Yourself (Free)

Scan your Ports with Port Detective: lets you scan your PC ports to see which are open, in use, or blocked. This will help you find out how vulnerable your system is to hackers, and will also let you know which ports you can use for applications such as Web servers
http://www.portdetective.com/

Scan Remote COmputers (Free)

Advanced port scanner is a small, fast, robust and easy-to use port scanner for Win32 platform. It uses a multithread technique, so on fast machines you can scan ports very fast. Also, it contains descriptions for common ports, and can perform scans on predefined port ranges. You can use it for FREE. Download now!
http://www.antivirus.com.au/radmin/famatech_nu/portscanner.htm

PeteL
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