記一次sftp登入不上的處理

需要上傳檔案到centos7.4上，用xshell的sftp,還是用其他的sftp工具，甚至是sftp Ip，都報以下錯誤

Connecting to 192.168.20.200:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
Connection closing...Socket close.

Connection closed by foreign host.

Disconnected from remote host(192.168.20.200) at 22:28:52
           

Subsystem	sftp	/usr/libexec/openssh/sftp-server
           

find / -name sftp-server
find: ‘/proc/32473’: No such file or directory
find: ‘/proc/32875’: No such file or directory
find: ‘/proc/32885’: No such file or directory
/tmp/openssh4pL_RJ/openssh-8.7p1/sftp-server
/usr/local/openssh/libexec/sftp-server