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出问题时 ping 47.74.229.224 的结果如下 Last login: Fri Mar  8 15:51:39 on ttys000 guojiangdeMacBook-Pro:~ guojianghou$ ssh root@7.74.229.224 ssh: connect to host 7.74.229.224 port 22: Operation timed out guojiangdeMacBook-Pro:~ guojianghou$ ping 47.74.229.224 PING 47.74.229.224 (47.74.229.224): 56 data bytes Request timeout for icmp_seq 0 64 bytes from 47.74.229.224: icmp_seq=1 ttl=49 time=48.440 ms 64 bytes from 47.74.229.224: icmp_seq=2 ttl=49 time=159.454 ms 64 bytes from 47.74.229.224: icmp_seq=3 ttl=49 time=48.167 ms 64 bytes from 47.74.229.224: icmp_seq=4 ttl=49 time=56.669 ms 64 bytes from 47.74.229.224: icmp_seq=5 ttl=49 time=76.743 ms 64 bytes from 47.74.229.224: icmp_seq=6 ttl=49 time=48.573 ms 64 bytes from 47.74.229.224: icmp_seq=7 ttl=49 time=48.700 ms 64 bytes from 47.74.229.224: icmp_seq=8 ttl=49 time=48.298 ms 64 bytes from 47.74.229.224: icmp_seq=9 ttl=49 time=48.796 ms Request timeout for icmp_seq 10 64 bytes from 47.74.229.224: icmp_seq=11 ttl=49 time=48.476 ms 64 bytes from 47.74.229.224: icmp_seq=12 ttl=49 time=47.967 ms 64 bytes from 47.74.229.224: icmp_seq=13 ttl=49 time=56.815 ms 64 bytes from 47.74.229.224: icmp_seq=14 ttl=49 time=48.563 ms 64 bytes from 47.74.229.224: icmp_seq=15 ttl=49 time=48.941 ms 64 bytes from 47.74.229.224: icmp_seq=16 ttl=49 time=54.279 ms 64 bytes from 47.74.229.224: icmp_seq=17 ttl=49 time=48.217 ms 64 bytes from 47.74.229.224: icmp_seq=18 ttl=49 time=48.750 ms 64 bytes from 47.74.229.224: icmp_seq=19 ttl=49 time=49.293 ms 64 bytes from 47.74.229.224: icmp_seq=20 ttl=49 time=48.623 ms Request timeout for icmp_seq 21 64 bytes from 47.74.229.224: icmp_seq=22 ttl=49 time=48.466 ms 64 bytes from 47.74.229.224: icmp_seq=23 ttl=49 time=48.385 ms 64 bytes from 47.74.229.224: icmp_seq=24 ttl=49 time=48.978 ms 64 bytes from 47.74.229.224: icmp_seq=25 ttl=49 time=48.386 ms