If you use putty in 64-bit win7, the following error occurs: SSH, Telnet and Rlogin client has stopped working. This prompt is displayed due to security reasons, if Windows 7 has automatically disabled the telnet service, use the following steps to enable telnet: 1. "Control Panel"-> "program"-> "turn on or off windows" and find "telnet Server" and "telnet client. go to the System Service list and enter "services. msc "go to the service list and find the telnet service. Double-click it to change the Startup Type from" disabled "to" automatic "and click Start. However, when starting at, you may be prompted: Error 1068, the dependent service or group cannot be started here. Find the last tab "dependency" to view the dependency of telnet. Probably (1) Remote Procedure Call (RPC) (2) Secondary Logon (3) TCP/IP protocol driver (1), (3) item is enabled normally, and only the second item is also disabled by default. In this case, you only need to set the Startup Type of Item (2) to "automatic" and after it is started, you can start telnet. After the preceding operations, telnet is available.