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Nmap scan report for dl.rsscc.cn (123.57.79.20) Host is up (0.19s latency). Not shown: 996 filtered tcp ports (no-response), 1 filtered tcp ports (host-prohibited) PORT STATE SERVICE 21/tcp open ftp 80/tcp open http 443/tcp open https Nmap done: 1 IP address (1 host up) scanned in 13.19 seconds