- Check Port Status Windows 10
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- Check Port Status Windows Powershell
- How To Check Port Status Windows
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Dec 28, 2017 Search for Windows powershell and open its console in your Windows 2016 server. Use “Test-NetConnection ” command to check the port status. Let’s check if ports 3389 is open. Test-NetConnection 10.0.1.15 -port 3389. If port is open you will get output like below. Way to Check Open Ports in Windows 10 Using CMD. Here is how to check open Ports in Windows 10 Using CMD – To find port-use with process names. Follow along with these steps to get the list of ports in use and the names of the processes tied up with them respectively. Step-1: Open Run dialog box by pressing Win+R hotkeys.
- Apr 04, 2018 It’s also possible that a USB port doesn’t output as much power as it should. It may have to do with a fault in the hardware, something wrong with your system’s internal wiring, your power supply unit, or maybe even the driver. If you suspect a port is under-performing, you can check power output of a USB port with an app called USBDeview.
- Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful in testing port forwarding setup on a machine. For instance, if you're facing connection issue with a program (email, IM client etc) then it may be possible that the port required by the application is getting blocked by firewall or ISP.
On the Windows platform, what native options to I have to check if a port (3306, for example) on my local machine (as in
HopelessN00blocalhost
), is being blocked?49k2525 gold badges121121 silver badges194194 bronze badges
Boris PavlovićBoris Pavlović
4 Answers
Since you are on the Windows machine, these things can be done,
- Execute the following command and look for a ':3306' listener (you did not mention UDP/TCP). This will confirm there is something running on the port.netstat -a -n
- After this, if you are expecting incoming connections on this port and feel that the firewall may be blocking them, you could start windows firewall logging and check the logs for dropped connections
- Go to the Windows Firewall, Advanced settings
- Click on the Settings button next to 'Local Area Connection'
- Select 'Log dropped packets'
- Look at the log file location (if not present define one)
- Click OK
- Now, when the connection attempt is made (assuming you know when this is done), look at the log file for a drop on port 3306.
- If this is seen, you will want to add an exception for this port.
- There is one more command to check the firewall state
(Update for Windows 7 users -- as referred byNick
below -- use netsh advfirewall firewall)netsh firewall show state- this will list the blocked ports as well as active listening ports with application associations
- This command will dump the Windows firewall configuration detailnetsh firewall show config
If you have an active block (incoming connections are being dropped by firewall) after you start logging, you should see that in the log.
If you are running an application/service that is listening on 3306, the firewall config should show it to be Enabled. If this is not seen, you have probably missed adding an exception with the firewall to allow this app/service.
Finally, port 3306 is typically used for MySQL. So, I presume you are running MySQL server on this windows machine. You should therefore see a listener for 3306 accepting incoming connections. If you do not see that, you need to work with your application (MySQL) to get that started first.
niknik6,61322 gold badges2121 silver badges2929 bronze badges
NETSTAT
will tell you if the port is listening but it will not tell you if the port is open to the outside world. What I mean by this is that NETSTAT
may show that the 0.0.0.0 is LISTENING on port 3306 but a firewall may still be blocking that port which is preventing outside connections; so it isn't sufficient to rely on NETSTAT
alone.The best way to check if a port is blocked is to do a port scan from the client machine.
There are many ways to do a port scan but since you mentioned being on Windows then I will suggest the Microsoft command line utility
PortQry
and the Graphical version PortQryUITo test all open ports:
To test a specific port:
For example to test the Web interface of a router at 192.168.1.1:
Which returns:
Where as testing on a local machine with no HTTPD running returns:
Using a PortScan utility you will get one of 3 results.
Listening
means the server is listening on the specified portFiltered
means it received a TCP acknowledgement packet with the Reset flag set which likely indicates a firewall or software issueNot Listening
means it didn't receive a response at all
telnet
is another command line option that is usually installed on the OS by default. This command line utility can be used a quick way to see if a port responds to a network request. To use
telnet
you would simply issue the following command from a command prompt:The command above should give you a quick indication if the port
3306
on the localhost
is responding.Tim PennerTim Penner
Since PowerShell 4.0 you can use the command
Test-NetConnection
If you want to test Port 3306 as in your example the command is
Marcel JanusMarcel Janus72022 gold badges1010 silver badges2929 bronze badges
If you can telnet to the port from the local machine (using the external IP address), but not from another machine - then it is being blocked somewhere between.
Note that a firewall on your local machine could prevent even the first action.
Brent Brent 14.8k1616 gold badges6161 silver badges9898 bronze badges
protected by Michael Hampton♦Apr 4 '16 at 0:20
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Whenever an application wants to make itself accessible over the network, it claims a TCP/IP port, which means that port can’t be used by anything else. So how do you check open ports to see what application is already using it?
An IP address specifies a computer—or other network device—on a network. When one device sends traffic to another, the IP address is used to route that traffic to the appropriate place. Once the traffic reaches the right place, the device needs to know which app or service to send the traffic on to. That’s where ports come in. If the IP address is akin to a street address on a piece of mail, the port is something like the name of the person at that residence who gets the mail. For the most part, you don’t need to worry about ports. But once in a while, you might encounter an app that’s set to listen for traffic on the same port that another app already has in use. In that case, you’ll need to identify the app that already has that port in use.
There are a number of ways to tell what application has a port locked, but we’re going to walk you through a couple of built-in ways that use the Command Prompt, and then show you a great freeware application that makes it even easier. All these methods should work no matter which version of Windows you use.
Use Built-In Tools to See What is Listening on a Port
We’ve got two commands to show you. The first lists active ports along with the name of the process that’s using them. Most of the time, that command will work fine. Sometimes, though, the process name won’t help you identify what app or service actually has a port tied up. For those times, you’ll need to list active ports along with their process identifier numbers and then look those processes up in Task Manager.
Option One: View Port Use Along with Process Names
First, you’ll need to open the Command Prompt in administrator mode. Hit Start, and then type “command” into the search box. When you see “Command Prompt” appear in the results, right-click it and choose “Run as administrator.”
At the Command Prompt, type the following text and then hit Enter:
RELATED:How to Save the Command Prompt’s Output to a Text File in Windows
After you hit Enter, the results may take a minute or two to fully display, so be patient. Scroll through the list to find the port (which is listed after the colon to the right of the local IP address), and you’ll see the process name listed under that line. If you’d like to make things a little easier, remember that you can also pipe the results of the command to a text file. You could then just search the text file for the port number you’re after.
Here, for example, you can see that port 49902 is tied up by a process named picpick.exe. PicPick is an image editor on our system, so we can assume the port is actually tied up by the process that regularly checks for updates to the app.
Option Two: View Port Use Along with Process Identifiers
If the name of the process for the port number you’re looking up makes it difficult to tell what the related app is, you can try a version of the command that shows process identifiers (PIDs) rather than names. Type the following text at the Command Prompt, and then hit Enter:
The column at the far right lists PIDs, so just find the one that’s bound to the port that you’re trying to troubleshoot.
Next, open up Task Manager by right-clicking any open space on your taskbar and choosing “Task Manager.”
If you’re using Windows 8 or 10, switch to the “Details” tab in Task Manager. In older versions of Windows, you’ll see this information on the “Processes” tab. Sort the list of process by the “PID” column and find the PID associated with the port you’re investigating. You might be able to tell more about what app or service has the port tied up by looking at the “Description” column.
If not, right-click the process and choose “Open file location.” The location of the file will likely give you clues as to what app is involved.
Check Port Status Windows 10
When Once you’re there, you can use the End Process, Open File Location, or Go to Service(s) options to control the process or stop it.
Use NirSoft CurrPorts to View What is Listening on a Port
If you aren’t really the Command Prompt type—or you’d rather just use a simple utility to do all this in one step—we recommend the excellent freeware CurrPorts utility by NirSoft. Go ahead and download the tool. Just make sure you get the right version (the regular version is for 32-bit Windows and the x64 version is for 64-bit Windows). It’s a portable app, so you won’t need to install it. Just unzip the download folder and run executable.
Check Port Status Windows Online
In the CurrPorts window, sort by the “Local Port” column, find the port you’re investigating, and you can see everything—the process name, PID, port, the full path to the process, and so on.
To make it even easier, double-click on any process to see every single detail in one window.
When you’ve determined what app or service has the port you’re investigating tied up, it’s up to you how to handle it. If it’s an app, you may have the option to specify a different port number. If it’s a service—or you don’t have the option to specify a different port number—you’ll likely have to stop the service or remove the app.
Check Port Status Windows Powershell
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