Thank you for your support in solving my problem. Now the problem is:
1. When I try to reinstall the system, it appears as normal: "thank you! Reinstallation will be started. With the next reboot the server will be installed. The boot device has been set to default."
But after one hour, it is still in the state of "hourglass", that is, "pending"
And the words "warning: reinstallation not completed yet, reinstallation will be cancelled!" are displayed.
2. Ping can be done by using the Ping tool, which seems to be normal, but putty still can't connect and the word "login as" can't appear.
Please help me, thank you very much!
[root@srv10848 ~]# ping6 2a02:0180:0006:0001:0000:0000:0000:16c3
PING 2a02:0180:0006:0001:0000:0000:0000:16c3(2a02:180:6:1::16c3) 56 data bytes
64 bytes from 2a02:180:6:1::16c3: icmp_seq=1 ttl=61 time=0.278 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=2 ttl=61 time=0.209 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=3 ttl=61 time=0.256 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=4 ttl=61 time=0.211 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=5 ttl=61 time=0.227 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=6 ttl=61 time=0.218 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=7 ttl=61 time=0.214 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=8 ttl=61 time=0.252 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=9 ttl=61 time=0.222 ms
64 bytes from 2a02:180:6:1::16c3: icmp_seq=10 ttl=61 time=0.223 ms
^C
--- 2a02:0180:0006:0001:0000:0000:0000:16c3 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9207ms
rtt min/avg/max/mdev = 0.209/0.231/0.278/0.021 ms
My information:
Servername: srv10215.blue.kundencontroller.de
IPv6: 2a02:0180:0006:0001:0000:0000:0000:16c3
Thanks again!