background:
It is found that the telnet service in win7 is not turned on. Since it needs to be used for development, it needs to be turned on manually.
Turn on steps:
1. Install telnet service
2. Service startup
Specific implementation steps:
1. Find "Turn Windows features on or off" in Control Panel
2. After opening, find "telnet server" and "telent client" and click "OK" after selection
3. Find "Services", the specific method is "Control Panel\System and Security\Administrative Tools", find "telnet" after finding the service, and then set the automatic startup state
ps：
Telnet ip port can determine whether a port is open