SFP on Synology

Posted on 2011-09-23
Last Modified: 2012-05-12

I tried to install/run SFTP on my Synolgy NAS DS 210J (latest version of OS, don't know which Linux version is under the hood).
Therefore I followed this article:

I can ssh with putty but not sftp. Config of server should be ok, this is most important line:
Subsystem      sftp    /usr/libexec/sftp-server
But it does not work. Can you assist me in troubleshooting?

This is the connection log:

Status:      Connecting to
Response:      fzSftp started
Command:      open "root@" 22
Command:      Pass: *********
Status:      Connected to
Error:      Fatal: unable to initialise SFTP on server: could not connect
Error:      Could not connect to server
Status:      Waiting to retry...
Error:      Connection attempt interrupted by user

This is the config of the server:

#       $OpenBSD: sshd_config,v 1.82 2010/09/06 17:10:19 naddy Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options change a
# default value.

#Port 22
#AddressFamily any
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024

# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#RSAAuthentication yes
#PubkeyAuthentication yes

#ListenAddress ::

# The default requires explicit activation of protocol 1
#Protocol 2

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2

#PubkeyAuthentication yes
#AuthorizedKeysFile     .ssh/authorized_keys

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes
ChallengeResponseAuthentication no

# Kerberos options
#KerberosAuthentication no
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
#UsePAM no

#AllowAgentForwarding yes
#AllowTcpForwarding yes
# no default banner path
#Banner none

# override default of no subsystems
Subsystem      sftp    /usr/libexec/sftp-server
#Subsystem       sftp    internal-sftp -f DAEMON -l VERBOSE
#Subsystem       sftp    /usr/syno/sbin/sftp-server -l DEBUG3

# Example of overriding settings on a per-user basis
#Match User anoncvs
#       X11Forwarding no
#       AllowTcpForwarding no
#       ForceCommand cvs server

Question by:janhoedt
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Expert Comment

ID: 36588306
Do you actually have an executable /usr/libexec/sftp-server ?
LVL 21

Accepted Solution

Papertrip earned 500 total points
ID: 36588704
comment out:
Subsystem      sftp    /usr/libexec/sftp-server

Open in new window

#Subsystem       sftp    internal-sftp -f DAEMON -l VERBOSE

Open in new window

reload sshd and try again.

Author Comment

ID: 36589990
There is no sftp at the location you mention:

DS> cd libexec/
DS> ls  share_delete             share_set
But it should be installed as

DS> ipkg install openssh-sftp-server
Package openssh-sftp-server (5.9p1-1) installed in root is up to date.
Nothing to be done
Successfully terminated.
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LVL 21

Expert Comment

ID: 36590081
Did you try my suggestion?

Author Comment

ID: 36590086
I will

Expert Comment

ID: 36590675
What does 'ipkg files openssh-sftp-server' output?

Author Comment

ID: 36938352
Have to park this question since I cannot troubleshoot this for the time being. Will reopen/refer to it when timeslot would occur.

Author Closing Comment

ID: 36938355
Please see latest remark, can't ask other question without closing this so I'll have to close. Will reopen/refer to this later.

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