If Your Xfinity Security System Reads Open How Do You Find Out Which Is Open

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Checking if a port is opened is actually pretty elementary. The correct way to do it just depends on whether you're using a Mac or PC and what kind of port you're checking. Nosotros'll walk you through how to do it step-by-step, plus show you how to check if an app is allowed through your firewall.

1. i

   Enable Telnet for Windows. Y'all tin can use Telnet to bank check if a certain port is open on your local router or admission point. Here's how to enable it:

   • Blazon windows features in to the search bar. If you don't run into the search bar, click the circle or magnifying glass to the right of the Beginning carte.
   • Click Plow Windows features on or off.
   • Cheque the box adjacent to Telnet Client and click OK.
   • Click Close when the app is finished installing.

2. 

   ii

   Open a command prompt. Here's how:

   • Type cmd into the Windows search bar.
   • Click Command prompt in the search results.

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3. 3

   Type ipconfig at the prompt and press ↵ Enter . This displays a agglomeration of network information.

4. iv

   Write downwardly the router'southward IP address. The address that appears side by side to "Default Gateway" in the ipconfig results is the local address of your router.

5. 5

   Type telnet at the prompt and press ↵ Enter . This opens the Microsoft Telnet prompt.

6. 6

   Type open (router'southward IP address) (port number). For example, if you wanted to see if port 25 is open on your router, and your router's IP accost is 10.0.0.i, you lot would blazon open 10.0.0.1 25.

7. 

   7

   Press ↵ Enter . Telnet will endeavour to connect to the port.

   • If you see a message that says "Please press Enter" or "Press whatever central to continue," the port is open up.
   • If yous see a message that says "Could non open connectedness," the port is not open.

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1. 

   1

   Open a Final window. To do this, open Spotlight by clicking the magnifying drinking glass at the tiptop-right corner of the screen, type terminal, and and then click Terminal in the search results.

   • Use this method to run into if a port is open on your local router or access point.

2. 2

   Type netstat -nr | grep default at the prompt and press ⏎ Return . The router'south IP address appears next to "default" at the elevation of the results.

3. 3

   Type nc -vz (your router'south IP address) (port). For example, if you wanted to run across if port 25 is open on your router, and your router's IP address is x.0.0.1, you would blazon nc -vz 10.0.0.1 25.^[i]

4. four

   Printing ⏎ Return . Hither's how to interpret the results:^[two]

   • If the port is open, you lot'll run across a bulletin that says the connection succeeded.
   • If the port is closed, you lot'll see a bulletin that says the connection was refused or timed out.

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1. 

   1

   Open Windows search and blazon firewall. If the search bar is not already open, click the circle or magnifying glass to the right of the Start menu to open up it.

   • Apply this method if y'all want to see if Windows is set up to allow an app you've installed to communicate through your firewall.
   • The Windows firewall is enabled past default. If you've installed your ain firewall software, use that software to cheque if an app is immune through.

2. ii

   Click Windows Defender Firewall . This opens your Firewall and Network Protection settings.

3. three

   Click Let an app through firewall . It's one of the text links near the bottom of the window. A listing of apps allowed through the firewall will appear.

   • If the app is immune through the firewall only when yous're connected to a network you lot've marked as "individual" (such as when you lot're on your home network), a bank check volition appear in the "Private" cavalcade next to the app.
   • If the app is allowed through the firewall when you're continued to a public network, a check volition appear in the "Public" column.

4. 

   4

   Let an unlisted app or port through the firewall. If yous don't see the app on the "Immune apps and features" listing, click the Alter Settings push button at the top-correct corner, and and then follow these steps:

   • Click Let another app near the lesser.
   • Click Browse, select the app, so click Open.
   • Click Network Types near the bottom-left corner, select a privacy preference, and so click OK.
   • Click Add to add the app, and and so click OK.

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1. 1

   Become to http://www.canyouseeme.org in a spider web browser. You can use it to see if a port on your computer or network is accessible on the internet. The website will automatically detect your IP address and display it in the "Your IP" box.^[iii]

   • There are many different sites you can use to check for an open port. Search for "open port check tool" in your favorite search engine to find an culling, if desired.

2. 

   2

   Enter the port. Type the port you want to bank check (e.g., 22 for SSH) into the "Port to Check" box.^[4]

3. 

   three

   Click Cheque Port . If the port is open up and available, you'll meet a confirmation message. If not, you lot'll see a bulletin that says "Error: I could not see your service on (your IP accost) on port (the port number)."^[v]

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1. one

   Click the bill of fare and select Arrangement Preferences . The Mac firewall is not enabled by default.^[six]

2. 2

   Click Security & Privacy . It's the house icon on the meridian row.

3. 

   3

   Click the Firewall tab. Information technology's virtually the top-heart role of the window.

   • If yous run into the message "Firewall:On" virtually the top of the tab, this means your firewall is agile.
   • If the firewall is not active but you want it to be, click the padlock icon at the bottom-left role of the window, enter your administrator countersign, and then click Turn On Firewall.

4. 

   4

   Click Firewall Options . This opens your settings, including a list of apps and services set to either permit or disallow incoming connections.

   • If an app or service has a green dot and the text "Let incoming connections," that means its port is open.
   • If you see a ruby dot that says "Block incoming connections," the port is airtight.
   • You can toggle whether a port is immune or non allowed by clicking the double-arrow icon next to the app'south current condition, and choosing an option.

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Add New Question

• Question

  How do I check if a port is open up Windows 10?

  

  Luigi Oppido is the Owner and Operator of Pleasure Point Computers in Santa Cruz, California. Luigi has over 25 years of experience in general computer repair, information recovery, virus removal, and upgrades. He is also the host of the Computer Man Show! broadcasted on KSQD covering key California for over two years.

  

  Computer & Tech Specialist

  Expert Answer

  An piece of cake mode to do this is to go to canyouseeme.org and type in the port number into the webpage. It'll be able to tell you whether or non the port is open.

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If Your Xfinity Security System Reads Open How Do You Find Out Which Is Open

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