I tried to NSX-T but no luck. there are no problem of hdd and sftp server.
any advice ?
Try removing "SHA256:" from the SSH fingerprint key.
Without requiring any other info in terms which Linux distro you're using, sshd setup etc. - can you pls check your configuration against useful blog I found on this matter, which I used couple of times: https://thinkvirtualblog.wordpress.com/2019/08/05/setup-an-ubuntu-server-as-sftp-server-for-nsx-t-ba...