mirror.nju.edu.cn 无法连通
nmap -sT -p 80 mirror.nju.edu.cn Starting Nmap 7.80 ( https://nmap.org ) at 2024-06-21 20:41 CST Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn Nmap done: 1 IP address (0 hosts up) scanned in 3.04 seconds nmap -sT -p 443 mirror.nju.edu.cn Starting Nmap 7.80 ( https://nmap.org ) at 2024-06-21 20:41 CST Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn Nmap done: 1 IP address (0 hosts up) scanned in 3.04 seconds 
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