How to check if port 445 is closed

To check whether port 445 is closed, you can use the telnet command, port scanning tool or online port scanning tool. Detailed introduction: 1. Use the telnet command, open the command prompt or terminal, enter the "telnet IP address 445" command and press the Enter key, where the IP address is the IP address of the target host to be tested. If port 445 is closed Yes, the command line will display a connection failure or unable to connect message, which means that port 445 is closed. If port 445 is open, the command line will display a successful connection, etc.

To check whether port 445 is closed, you can use the following methods:

Method 1: Use the telnet command

1. Open Command Prompt (Windows) or Terminal (Mac and Linux).

2. Enter the following command and press Enter:

   telnet IP地址 445

Where, the IP address is the IP address of the target host to be tested.

3. If port 445 is closed, the command line will display a message indicating that the connection failed or cannot be connected. This means port 445 is closed.

4. If port 445 is open, the command line will display a message that the connection is successful or the connection has been established. This means port 445 is open.

Method 2: Use the port scanning tool

You can use the port scanning tool to scan the port status on the target host. The following are some commonly used port scanning tools:

1. Nmap: Nmap is a powerful open source port scanning tool that can be used on Windows, Mac and Linux. You can use the following command to scan port 445:

   nmap -p 445 IP地址

Where, the IP address is the IP address of the target host to be tested. The scan results will show the status of port 445 (open, closed or filtered).

2. Zenmap: Zenmap is the graphical interface version of Nmap, providing a more intuitive and easy-to-use interface. You can view the status of port 445 by selecting the Scan tab, entering the IP address of the target host and selecting port 445, and then starting the scan.

Method 3: Use an online port scanning tool

If you do not want to install the port scanning tool locally, you can also use an online port scanning tool to view the status of port 445. The following are some commonly used online port scanning tools:

1. HackerTarget: HackerTarget provides a simple online port scanning tool that can be scanned by entering the IP address of the target host and the port range to be scanned. You can enter 445 as the port to scan, and then start a scan to see the status of port 445.

2. Pentest-Tools: Pentest-Tools is a platform that contains multiple online security testing tools, including port scanning tools. You can select the port scanning tool on this platform and enter the IP address of the target host and the port range to be scanned to scan.

No matter which method is used, you need to pay attention to the following points:

- You need to have permission to scan the port of the target host. Without sufficient permissions, the status of port 445 may not be accurately determined.

- Before scanning target hosts, legal authorization should be obtained and legal and ethical guidelines should be followed.

- Make sure the target host's firewall or security policy allows port scanning. If the target host's firewall blocks the scan request, the status of port 445 may not be accurately determined.

To summarize, to check whether port 445 is closed, you can use the telnet command, port scanning tool or online port scanning tool. These methods can help determine the status of port 445 (open, closed, or filtered) for network security assessment and configuration adjustments. When performing port scanning, legal and ethical principles should be followed and legal authorization should be obtained.

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