D:\Program Files\putty>psftp zh-dev.purasbar.com -i Purasbar.ppk
login as: oct1158
bash: line 2: exec: sftp-server: not found
FATAL ERROR: Received unexpected end-of-file from SFTP server

D:\Program Files\putty>

解決方案：

修改/etc/ssh/sshd_config文件，在文件開頭添加

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

然後重啟ssh伺服器。

sudo systemctl restart sshd