8443 is the default port for tomcat to open SSL text service. You need to add the port number 8443 when visiting, which is equivalent to192.192.193.438+05438+022. The following figure shows the open state of tcp22 port.

2. The following figure shows the closed state of tcp22 port.

3. Method 2: You can use the command nc(netcat) to check the open state of the port. The method is: run NC-z192.192.5438+093.5438+0122 and open it;

4. The following figure shows the closed state of tcp22 port:

6. You can also use this method to view multiple ports at once, for example: