Can't SSH to droplet through ipv4, but ipv6 is accessable
I can’t ssh to my droplet through ipv4 connection, it hangs until operation timed out.
Every time it happens, I can see sockets with SYN_RECV state on the remote machine that I wanted to access.
However, I can ssh to it though ipv6 connection.
And ping works well both through ipv4 and ipv6.
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