SFTP除root其它用户无法登录

AIX 6.1的系统，用户前段时间做过安全加固，SFTP就登录不上，
Response: fzSftp started, protocol_version=8
Command: open "192.168.100.11" 22
Command: Pass:
Error: Authentication failed.
Error: Critical error: Could not connect to server
Status: Disconnected from server
Status: Connecting to 192.168.100.11...
Status: Connected to 192.168.100.11
**Error: Received unexpected end-of-file from SFTP server
Error: Could not connect to server**
Status: Waiting to retry...
Status: Connecting to 192.168.100.11...
Response: fzSftp started, protocol_version=8
Command: open "192.168.100.11" 22
Command: Pass:
Status: Connected to 192.168.100.11
**Error: Received unexpected end-of-file from SFTP server
Error: Could not connect to server
Status: Disconnected from server**
Status: Connecting to 192.168.100.11...
Status: Connected to 192.168.100.11
Status: Retrieving directory listing...
Status: Listing directory /
Status: Directory listing of "/" successful

除了ssh/sshd_config
Subsystem sftp /usr/libexec/openssh/sftp-server
还什么影响sftp的？