安徽电信看起来好像是封了所有入站端口...

[eriehl]

 ~
𝕲  python -c 'from requests import get;print(get("https://api.ipify.org").text)'
117.65.xxx.xxx
 ~
𝕲  sudo nmap -sA -Pn 117.65.xxx.xxx -p1-65535                                    21-01-12 - 1:05:08
Password:
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-01-12 01:05 CST
Nmap scan report for 117.65.xxx.xxx
Host is up (0.000080s latency).
All 65535 scanned ports on 117.65.xxx.xxx are unfiltered

Nmap done: 1 IP address (1 host up) scanned in 0.79 seconds

我是小白不太懂这个，不过这确实不太对劲

[ysc3839]

你这结果看不出什么，就是正常的没监听端口吧？上面写着 unfiltered，说明正常返回 refuse 了。
而且你这是内网扫描端口？那也不会经过运营商的防火墙。