Jiangsu Unicom Broadband, which was just installed, logged in with proxy IP, and found that the password verification IP address of port 3 128 could not log in. I don't know why.

Check for yourself. If the port is disconnected, ask Unicom customer service.

To view the ports, you can use the Netstat command:

Click "Start → Run" in turn, enter "cmd" and press enter to open the command prompt window. Type "netstat -a -n" at the command prompt, and then press Enter to view the port number and status of TCP and UDP connections displayed in digital form.

Netstat command usage

Command format: netstat-a-e-n-o-s-an.

-a displays all active TCP connections and TCP and UDP ports that the computer listens to.

-e indicates the number of bytes and packets sent and received by Ethernet.

-n indicates that only the addresses and port numbers of all active TCP connections are displayed in digital form.

-o displays the active TCP connections, including the process ID(PID) of each connection.

-s indicates that statistics of various connections, including port numbers, are displayed by protocol.

-View all open ports

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