我的安全组在EC2上设置

  TCP
端口（服务）来源行动
22（SSH）0.0.0.0/0删除
80（HTTP）0.0.0.0/0~~MD~~aux删除
443（HTTPS）0.0.0.0/0~~MD~~aux删除
 

输出：当我运行的telnet

  JP $远程登录passionate4.net
尝试50.18.159.124 ...
远程登录：连接地址50.18.159.124：操作超时
远程登录：无法连接到远程主机
 

Ubuntu的EC2服务器

 的ubuntu @ IP-10-166-185-18：〜$ sudo的netstat的-nup -l
活跃​​的互联网连接（仅服务器）
原始的recv-Q发送-Q本地地址外国地址状态的PID /计划名称
UDP 0 0 0.0.0.0:68 0.0.0.0:* 400 / dhclient3
 

解决方案

Telnet使用端口23，您不必在您的安全组。

Settings of my security group on EC2

TCP
Port(Service) Source    Action
22 (SSH)    0.0.0.0/0   Delete
80 (HTTP)   0.0.0.0/0   Delete
443 (HTTPS) 0.0.0.0/0   Delete

Output: When I run the telnet

JP$ telnet passionate4.net
Trying 50.18.159.124...
telnet: connect to address 50.18.159.124: Operation timed out
telnet: Unable to connect to remote host

on ubuntu ec2 server

ubuntu@ip-10-166-185-18:~$ sudo netstat -nup -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 0.0.0.0:68              0.0.0.0:*                           400/dhclient3   

Telnet uses port 23, you don't have it in your security group.