【windows】View and open specific ports

To see if Windows 10 has a specific port open (such as port 1883), you can use the following steps:

1. Use the command line:

Open a command prompt or PowerShell. You can press Win + R keys, then type "cmd" or "powershell" and press Enter.

2. Use Telnet command:

Enter the following command and press Enter to attempt Telnet to the target port:

telnet localhost 1883

If a message similar to "Connection successful" or "Unreachable target host" appears, it indicates the status of the port. If the connection is successful, the port is open. If the target host cannot be reached, a firewall or other network settings may be blocking the connection.

If the Telnet command is not working, it may be because Windows 10 may not have the Telnet client feature enabled by default. The Telnet client feature can be enabled in Control Panel -> Programs -> Turn Windows features on or off.

3. Use a network scanning tool:

You can use a network scanning tool such as Nmap to scan whether specific ports are open. Nmap is a powerful network scanning tool that can be used to detect the port status of a host. Download and install Nmap, then use a command similar to the following to scan for open port 1883:

nmap -p 1883 localhost

If the port is open, you will see the corresponding status in the scan results.

Please note that opening ports may expose your system to security risks. In a production environment, make sure to open only necessary ports and take appropriate security measures to protect the system.

To open a specific port on Windows 10, you need to follow these steps:

Method One: Via Windows Firewall Settings

1. Open the control panel:

Press the Win + R keys, then type "control" and press Enter to open the Control Panel.

2. Go into Windows Firewall settings:

In Control Panel, select System and Security, and then select Windows Defender Firewall.

3. Create inbound rules:

In the left navigation bar, click "Advanced Settings."

4. Create a new inbound rule:

In the right window, click "Inbound Rules" and then click "New Rule..." in the right panel.

5. Configure rule properties:

Select the Port option in the wizard and click Next.

6. Select port type:

Select Specific local port and enter the port number you want to open (for example, 1883).
Select Allow connection and click Next.

7. Select a connection configuration:

You can choose Public, Private, or Domain, depending on your network settings.

8. Naming rules:

Give the rule a name and optional description, and click Next.

9. Complete the wizard:

Review the configuration and click Finish.

Method 2: Use the command line

You can also use the command line to open ports, which is useful for batch operations or automated setups. Open a command prompt or PowerShell window with administrator privileges, and then use the following command to open the port:

netsh advfirewall firewall add rule name="Open Port 1883" dir=in action=allow protocol=TCP localport=1883

This command will add a rule in Windows Firewall to allow incoming connections on port 1883 of the TCP protocol.

No matter which method you choose, make sure you stay safe when configuring your firewall rules. Open only necessary ports and consider using additional security measures to protect your system and network.