Is the FTP/SFTP server in VNXe3200 NAS share protocols unfinished/broken?
VNXe3200 storage system here with operating system version 220.127.116.1140299
I've before never used the FTP/SFTP servers option which is present on the NAS Servers "Sharing Protocols" configuration screen in the Unisphere web gui app, I've been running this machine for about 4 years now and only needed iSCSI, CIFS and NFS shares hosted off of it.
I now need to be able to use the SFTP server feature to be able to receive incoming system backup files from my Cisco CUCM VoIP phone system which has outgrown the old Linux box I was using as an SFTP file repository so I tried adding the SFTP service to my main CIFS NAS Server configs. It seemed to set up successfully, but I cannot successfully log in with an SFTP session from any network client (Linux command line, WinSCP, FileZilla, etc). I wish to have it use an active directory domain account just like the CIFS service is using for authentication, but I cannot get a successful SFTP session connected.
Here's a snippet from a WinSCP session log, which seems to show that it's actually making the initial connection but when it tries to do some actual work within that session.... I presume grab a directory listing off the server to display on the client screen, the session suddenly suffers an unexpected closed network connection immediately after this "primary command failed" which I'm guessing is an "ls -l"
There seems to be a grand total of Diddly and Squat available for documentation about the FTP/SFTP servers in the VNXe3200. And what's available for the VNX is too different to be useful.
WinSCP Session Logfile:
. 2018-10-19 20:45:56.544 Looking up host "172.21.5.121"
. 2018-10-19 20:45:56.544 Connecting to 172.21.5.121 port 22
. 2018-10-19 20:45:56.566 Server version: SSH-2.0-OpenSSH_5.1
. 2018-10-19 20:45:56.566 We claim version: SSH-2.0-WinSCP_release_4.1.9
. 2018-10-19 20:45:56.566 SSPI: acquired credentials for: voipbackup@CITYNET.CWF
. 2018-10-19 20:45:56.566 Cannot convert IP address to SPN: DNS is not trusted
. 2018-10-19 20:45:56.566 GSSKEX disabled: The operation completed successfully.
. 2018-10-19 20:45:56.567 Using SSH protocol version 2
. 2018-10-19 20:45:56.567 Doing Diffie-Hellman group exchange
. 2018-10-19 20:45:56.613 Doing Diffie-Hellman key exchange with hash SHA-1
. 2018-10-19 20:45:56.690 Host key fingerprint is:
. 2018-10-19 20:45:56.690 ssh-rsa 2048 48:f5:12:0e:b6:f9:23:f8:39:07:b7:2c:04:7b:91:5d
. 2018-10-19 20:45:56.690 Initialised AES-256 SDCTR client->server encryption
. 2018-10-19 20:45:56.690 Initialised HMAC-SHA1 client->server MAC algorithm
. 2018-10-19 20:45:56.690 Initialised AES-256 SDCTR server->client encryption
. 2018-10-19 20:45:56.690 Initialised HMAC-SHA1 server->client MAC algorithm
! 2018-10-19 20:45:56.730 Using username "firstname.lastname@example.org".
. 2018-10-19 20:45:59.542 Prompt (6, SSH password, , &Password: )
. 2018-10-19 20:46:06.876 Sent password
. 2018-10-19 20:46:06.890 Access granted
. 2018-10-19 20:46:06.890 Opened channel for session
. 2018-10-19 20:46:06.891 Primary command failed; attempting fallback
. 2018-10-19 20:46:06.891 Server unexpectedly closed network connection
* 2018-10-19 20:46:06.894 (ESshFatal) Server unexpectedly closed network connection.
* 2018-10-19 20:46:06.894 Authentication log (see session log for details):
* 2018-10-19 20:46:06.894 Using username "email@example.com".
* 2018-10-19 20:46:06.894
* 2018-10-19 20:46:06.894 Authentication failed.