To find the port, use the netstat command in the console operating system. To do this, select the menu "start" "Run" in the window that appears, write cmd and press Enter. Or select start–>All programs–>Accessories–>Command prompt. In the opened console, type netstat and press Enter. You will see a list of IP addresses and used ports on your computer.
To more fully explore the possibilities of command at a command prompt netstat /? and examine the information. For example, if you enter the netstat command with the –a option, the screen will display all connections and ports used. Netstat –o displays additional identifier of the process that is responsible for any connection. When you enter netstat –n will show the real IP addresses and numeric port values. The default also shows the DNS name and common aliases.
If you don't want to use the command line, download the TCPView utility from the official Microsoft website at http://technet.microsoft.com/ru-ru/sysinternals/bb897437. It provides the same functionality, but with a graphical interface. After downloading the program run it and agree with the license agreement. In the program window you will see the process using the network connection, Protocol, name and port, or the address of the recipient, condition.
There are also other programs you can use to define open ports on the computer. For example, Nmap (http://nmap.org), Advanced Port Scanner (http://www.radmin.ru/products/previousversions/portscanner.php), etc.
Another option is the use of specialized Internet services that performs ports. As an example may be a website http://2ip.ru. Navigate your browser to the address http://2ip.ru/port-scaner/ to check for potentially dangerous open ports. At http://2ip.ru/check-port/ you can check a specific port.
Advice 2: How to check open ports on your computer
Check ports on the computer in several ways. Open and not used by system processes or LAN port may be the cause of penetration into the system dangerous software, access your computer from outside.
First of all, such a situation is to prevent system protection: antivirus and firewall. If you have not installed, you must install and test the system. Moreover, it is desirable to establish an efficient and optimal means of protection (e.g. Kaspersky Internet Security). But if you have not used such software, possibly malicious, open port has been used dangerous applications.
The easiest way to view the presence of such port with a simple text, which can be performed online at the link: http://2ip.ru/port-scaner/. If the analysis of your computer, you'll find the open port (potentially dangerous for system), it will show red color. If a port in the course of the inspection found, make a note of the name separately because it urgently needs to be closed.
To close such port, you can use many programs. But the most simple is Windows Worms Doors Cleaner, with a volume of only 50 KB does not require installation (you can download it at: http://2ip.ru/download/wwdc.exe). After downloading it just run the malware and close the port that issued the computer analysis after the test. Then restart the computer. However, it is rather the action, so to speak, in haste, as the port may again be opened. Therefore, it is advisable to install a firewall (e.g. Outpost Firewall) and to maintain the status quo after the closure threat of the port.
Also does not interfere with the test computer using a free utility AVZ (can be downloaded from the link: http://www.z-oleg.com/secur/avz). During a quick test, it is necessary to detect errors of the system settings, probably shot down using the same port. For example, if you allow "anonymous user" you should disable it and restart the computer.