windows下退出telnet：可以参考下面linux退出，也可以直接关闭窗口。
linux退出telnet：
1.输入ctrl+]；显示出telnet>。
2.此时可以输入?，查看可以使用的命令。
close close current connection
logout forcibly logout remote user and close the connection
display display operating parameters
mode try to enter line or character mode ('mode ?' for more)
open connect to a site
quit exit telnet
send transmit special characters ('send ?' for more)
set set operating parameters ('set ?' for more)
unset unset operating parameters ('unset ?' for more)
status print status information
toggle toggle operating parameters ('toggle ?' for more)
slc change state of special charaters ('slc ?' for more)
auth turn on (off) authentication ('auth ?' for more)
encrypt turn on (off) encryption ('encrypt ?' for more)
forward turn on (off) credential forwarding ('forward ?' for more)
z suspend telnet
! invoke a subshell
environ change environment variables ('environ ?' for more)
? print help information
3.也可以直接输入close或quit，关闭/退出连接。