I was using the command ssh remote login server, and because the visit was the school's server, I use the campus VPN access.
But when the school every time I reboot the server via remote command, I usually will appear again landed ssh_exchange_identification: read: Connection reset the error.
I later found after as long as the VPN connection tool Easyconnect delete and re-use records are also deleted, and then re-download, I can re-log into the server.