Advice 1: How to test the port

To exchange information in a network transport Protocol TCP establishes connections between applications running on computers. In the address field of each packet data includes a numeric identifier that indicates which application will process the information. These numeric identifiers are called network ports. They are numbered in the range from 1 to 65535.
Instruction
1
To find out which applications and processes occupy ports on your computer, you can Windows tools. Start a command prompt from the start menu and type cmd. In the console window, type netstat –a –n –o
The command will list all active connections TCP and UPD ports and processes. In the column "Local address" is the IP address of your computer, a colon, the port number involved in the process from the PID column. "External address," reports the address of the remote host and port that listens to the relevant application.
How to test the port
2
To find out the process name by its number, the key combination of Ctrl+Alt+Delete call window "process Manager". Click on the "task Manager" and go to the tab "Processes". Each number in the PID column corresponds to the name of the process or application in the column "image Name".
If in the window "task Manager" does not list the PID in the main menu, choose the commands "View" and "Select columns". Check the box "Ref. the PID (process identifier)".
How to test the port
3
To check availability of any port, enter the cmd command prompt. In the console window, type telnet. The next line prompted to work with this team. Dial open , where domen_name – your domain name, and port_number is the port number.
If the port is closed, you will see a failure message: "failed to open connection to this node, the connection fails". If a team enters into a dialogue and generates valuable information – the port is open.
4
Ports protect the computer from unauthorized program actions-firewalls, or firewalls. It is sometimes necessary to open a port to communicate with another node. If you have enabled the built-in Windows firewall, via "control Panel" go to "Network connections". Right-click on the icon of Internet connection to display the context menu . Choose the command "Properties", go to the "Advanced" tab and click "Settings".
5
In the window "Windows Firewall", click "Add port". In the Name field, enter a description of the application, which will occupy the port in the "port Number" is an arbitrary number. If your version offers a choice of TCP and UPD, perform the procedure twice. If you add a port to work with a particular application, click the "Add a program" and specify the network path by clicking "Browse" or "Change scope".
How to test the port

Advice 2: How to check open port

Communication between the nodes in the network manage network protocols (logical interfaces) of different levels. Transport Protocol TCP establishes a connection between the host client and the node server and monitors the reliability of forwarding data packets. Data is exchanged between applications that are installed on the computers. The network port is a relative concept, a number that is assigned to the application that the transport Protocol knows where to direct packets. This number lies in the range from 1 to 65535.
Instruction
1
To the exchange of data occurred successfully, it is necessary that the appropriate ports at the nodes are open, i.e. can receive and transmit data. The process of finding open ports is called a scan. Do it and hackers, and system administrators: the first one to introduce malware on another computer, the second is to prevent the first to do it. Check the ports you can on your computer by installing a special program – scan the ports or by using online scanners. Go to the website WindowsFAQ.ru: http://www.windowsfaq.ru/content/view/451/82/.
2
If your computer has a firewall with attack detection and auto-blocking an attacking host, disable this option or add a WindowsFAQ.ru in the exception list, otherwise the scanner is blocked. In the section "scan Settings" enter the numbers of the first and final port of the range you want to check. It can be so-called reserved rooms from 1 to 1023, or all ports on your computer.
3
It is important to set the time during which the scanner will wait for a response from the port. If a "Timeout connection" (this option) to make too small, the port may not respond and will be incorrectly detected as closed. On the other hand, too much waiting time will significantly slow down the test. It is better to adopt the recommended value is 0.3 sec.
4
"Host address" and "host Name" is your IP address, which service determines automatically. If the address is not specified, scanning will not start. Click "OK" to start scanning. This will open a new window that displays the progress.
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After searching, the result will be displayed:- date and time of the inspection;
- address of the host;
numbers checked ports;
- the number of open and closed ports;
- duration of the scanning.In addition, the service will give recommendations on how to identify the process which uses the open ports.
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You can run a scan from your computer. Download the program "port Scanner v2.1" http://www.softportal.com/software-4285-skaner-portov.html.
7
In the section "Scan ports" enter in the boxes the start and end port numbers from the range that will be checked. If the computer is not in network, enter its IP address is not necessary. Ask in the appropriate section of the scan rate. It is determined by the response time of the port. It is better to choose the average speed, so, on the one hand, to avoid errors in the determination of the status of the port, and with another – not too tighten the verification process. Check the box "Output port information" to see the search result. The scanner finds open ports and determines the processes that use them.
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