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The specific method is as follows:
1, enter the keyboard shortcut WIN+R to open the running window.
2. Enter cmd and click OK.
3. The cmd command line window will pop up.
4. The detection format is telnetIP port number, for example, enter the command telnet172.16.10. 46638 . 66666666667
5. Enter the command in step 4 and press enter, as shown in the figure below, indicating that the port cannot be connected and cannot pass.
6. Enter the command in step 4 and press enter, as shown in the figure below, indicating that the port can be connected and opened.
Win 10telnet command to check whether the port is open is shared here. Users in need can follow the above method.