Advice 1: How to find closed ports

Often there are situations when the installed application is not performing any functions assigned to it. One possible cause is that the port on which the program receives/sends the packets, necessary for its operation, is closed. And how to find closed ports?
How to find closed ports
Instruction
1
The port may be closed as the modem / router and the provider side. In addition, it can be blocked by your firewall. Using standard Windows tools, you can check whether the closed port that the program uses for its operation.
In order to check open/closed ports in Windows, you must use the command line. To run press the key combination "Windows+R". After these steps, a window will open. It is necessary to enter "cmd". Then press "Enter".
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The screen will appear a black window, which experts call the Windows command prompt. You can now run the very tool that will allow you to view a list of closed ports. Enter in the command prompt "netstat".
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After typing, press "Enter". In the command prompt window will display information about all the open ports on your computer. This will be followed by the domain name of your personal computer and are separated from it by a colon. Note that all portsthat are not specified in this list are private. And if a port that your app uses included in this list, it will be necessary to close the application is able to function normally.
Note
If the information provided isn't sufficient, you can explore all the possibilities of the utility "netstat", by running it with –h. This means that in command prompt you need to enter command "netstat -h". Then in the window that appears you will see help on the program "netstat".
Useful advice
Also there is a utility called "Windows Worms Doors Cleaner", which can not only show the open and closed TCP/UDP ports, but also to close the open port. Thus, you can further protect your computer from various online threats, as well as numerous viruses. The program "NetStat Agent 2.0" can replace the built-in "netstat".

Advice 2: How to check which ports are open

Sometimes the user who wants to maximize control of your system, it is essential to clarify what the port's connections are open at the moment with his PC. This operation takes no more than a few seconds.
How to check which ports are open
Instruction
1
First of all, you can use the netstat command from the standard set of Windows XP. To log in to the Windows command prompt and there type "netstat 5" (without the quotes). After the execution of the command, you will see updates every 5 seconds (you can specify any other time) a report containing information about open connections, programs, and use their ports.
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Some may be easier to use the program TCPView or other software of similar purpose. In addition, the same information you may report any firewall running on your computer.

Advice 3: How to find out what ports the program uses

On the computer at the same time operates a variety of programs. If the program uses Internet connection, it is allocated a specific port. Sometimes the user may need to control which port is used by one or the other program.
How to find out what ports the program uses
Instruction
1
The need to determine which ports uses the program (or any program uses ports), typically occurs in the case of suspected infection by computer Trojans. If you notice something suspicious, open a command prompt: "start" – "All programs" – "Accessories" – "Command prompt".
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At the command prompt command tasklist and hit Enter. You will get information about all running system processes. Note the PID is the process ID. It will help to determine which program uses a particular port.
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In command prompt type netstat –aon and press Enter. You will see a list of current connections. In the column "Local address" at the end of each line indicates the port number. In the graph the PID specified process IDs. Looking at the port number and the corresponding PID, go to the processes list and the ID number will determine which process is using this port.
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If you are unable to name the process to understand which program it belongs to, use the one suitable in this case programs. For example, a program Everest, it is also Aida64. Run the program, select "Operating system", select "Processes". In the processes list find the right and view the line of its launch. This will help to determine which program owns a process.
5
Use for the same purpose the program AnVir Task Manager. It allows you to track all the suspicious processes, including the process of programs linking to the Internet. All suspicious processes are highlighted in the programs list in red.
6
If you see that port being used unknown to you program, in the presence of the current connection in the "External address" (netstat –aon), you will see the ip address of the computer from which the connection is established. In the column "Status" will be the value ESTABLISHED – if the connection is present at the moment; CLOSE_WAIT if the connection is closed; LISTENING, if the program is waiting for connection. The latter is typical for backdoors - one of the varieties of Trojans.

Advice 4: How to close ports in the firewall

Firewall, firewall and firewall to monitor incoming and outgoing Internet traffic. Properly configured firewall depends on the security of the network operation.
How to close ports in the firewall
Instruction
1
In the Windows operating system has a built-in firewall, but its capabilities are very limited, so it is better to use third party. One of the best programs of this type is Outpost Firewall.
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Before you start the configuration, open the main program window. Select "Settings" – "System", then scroll to the bottom of the tab section "Global rules and rawsocket access" and click "Rules".
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In the opened window click "Add". In the "Select the event for your rule", check the bird points "Where Protocol", "direction" and "local port". Below, in the "rule Description", click the mouse to "undefined" in the line "Where Protocol" and select the window that opens TCP Protocol.
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In the "rule Description" click "Not defined" in the line "Where, direction", select the connection type, select "Incoming (from a remote computer to your computer)". In the same box, click the "undefined" in the line "local port" and enter the port number that you want to close.
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In the "Select the actions for your rule", check the bird "to Block the data". Click "OK" and the selected port for incoming connections. You can shut it down for output by choosing in the described just above the settings instead of an incoming connection outgoing – "Outgoing (from your computer to a remote computer)".
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If you use regular firewall Windows, check the exceptions list: "start" – "control Panel" – "Windows Firewall" – "Exceptions". Remove the bird from the "Remote assistance", if you don't use them. You can to prevent exceptions by putting the bird on the "General" tab in the string "don't allow exceptions".
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The firewall in Windows 7 has more features than Windows XP, it can be used to control how individual ports, and within specified ranges. Create a rule for outbound connections, when you start the create rule wizard, select "All programs." Click "Next" in the opened window, select "Block the connection". Again click "Next", select the profile and specify a rule name. Then, in the rule properties specify the portsthat the firewall should block. Similarly, there is a rule for incoming connections.

Advice 5: How to check if a port is closed

Internet applications send information using special ports. The network port is allocated a system resource to running on a specific network host. If the port is closed, the program will not be able to go online, and therefore can not properly perform its functions.
How to check if a port is closed
Instruction
1
To check closed ports, you can use standard Windows tools. Go to the settings used programs, which can't successfully connect to your server, go to network settings. Remember you specified in the settings of the port.
2
Start a command prompt. To do this go to "start" - "All programs" - "Accessories" - "Command prompt". Also you can enter cmd in the search bar, application, start menu, and then select the found result.
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Enter the command netstat. This app allows you to view the list of running gateways through which the Internet connection on your computer. Press Enter.
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You will see a list of all active connections at the moment. The port number you can find in the first column. It is indicated after a colon, preceded by the IP address. If this list used by your application network gateway is not specified, it is closed.
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Enter in the settings of the programs used one of the open ports listed in the list, or try to open it using the standard tools of the system. Go to menu "start" - "control Panel". In the opened window, select the search bar and enter "firewall". Among the found results, click "Windows Firewall".
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Click the link for "more options", then click "inbound Rules" - "new rule". Follow the wizard and create a new incoming connection with a port number that uses your app.
Note
Open the gateway for an application only if the program you used, and you just know that she poses no threat to the security of the system. It malware software uses non-standard ports. When you use suspicious programs never disable the antivirus program and firewall.
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