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can't ssh an instance

I can ping 10.0.0.2 PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data. 64 bytes from 10.0.0.2: icmp_req=1 ttl=64 time=5.06 ms 64 bytes from 10.0.0.2: icmp_req=2 ttl=64 time=0.567 ms 64 bytes from 10.0.0.2: icmp_req=3 ttl=64 time=0.761 ms

but I can neither login an instance on the dashboard nor ssh an instance,likessh cirros@10.0.0.2,it will show ssh: connect to host 10.0.0.2 port 22: Connection refused

my nova-secgoup is :nova secgroup-list-rules default,show | IP Protocol | From Port | To Port | IP Range | Source Group | +-------------+-----------+---------+-----------+--------------+ | icmp | -1 | -1 | 0.0.0.0/0 | | | tcp | 22 | 22 | 0.0.0.0/0 | | | udp | 22 | 22 | 0.0.0.0/0 | | +-------------+-----------+---------+-----------+--------------+

so what's the problem ??????thank you