[root@alarmpi ~]# cat /etc/ssh/sftp_config
## MySecureShell Configuration File ##
#Default rules for everybody
<Group sftp>
        GlobalDownload          3m      #total speed download for all clients
                                        # o -> bytes   k -> kilo bytes   m -> mega bytes
        GlobalUpload            3m      #total speed download for all clients (0 for unlimited)
        Download                0       #limit speed download for each connection
        Upload                  0       #unlimit speed upload for each connection
        StayAtHome              true    #limit client to his home
        VirtualChroot           true    #fake a chroot to the home account
        LimitConnection         10      #max connection for the server sftp
        LimitConnectionByUser   1       #max connection for the account
        LimitConnectionByIP     2       #max connection by ip for the account
        Home                    /mnt/data/homes/$USER   #overrite home of the user but if you want you can use
                                                #       environment variable (ie: Home /home/$USER)
        IdleTimeOut             300     #(in second) deconnect client is idle too long time
        ResolveIP               true    #resolve ip to dns
#       IgnoreHidden            true    #treat all hidden files as if they don't exist
#       DirFakeUser             true    #Hide real file/directory owner (just change displayed permissions)
#       DirFakeGroup            true    #Hide real file/directory group (just change displayed permissions)
#       DirFakeMode             0400    #Hide real file/directory rights (just change displayed permissions)
                                        #Add execution right for directory if read right is set
        HideNoAccess            true    #Hide file/directory which user has no access
#       MaxOpenFilesForUser     20      #limit user to open x files on same time
#       MaxWriteFilesForUser    10      #limit user to x upload on same time
#       MaxReadFilesForUser     10      #limit user to x download on same time
        DefaultRights           0640 0750       #Set default rights for new file and new directory
#       MinimumRights           0400 0700       #Set minimum rights for files and dirs

        ShowLinksAsLinks        false   #show links as their destinations
#       ConnectionMaxLife       1d      #limits connection lifetime to 1 day

#       Charset                 "ISO-8859-15"   #set charset of computer
</Group>

#Rules only for group ftp
#<Group ftp>
#       Download        25 k/s
#       LogFile         /var/log/sftp-server_ftp.log    #Change logfile
#       ExpireDate      "2007-02-28 18:31:01"
#</Group>

#<Group sftp_administrator>
#       IsAdmin         true            #can admin the server
#       VirtualChroot   false           #you must disable chroot to have a full support of admin
#       StayAtHome      true
#       IdleTimeOut     0
#</Group>

#<Group old_client>
#       SftpProtocol            3       #force protocol SFTP
#       DisableAccount          true    #disable account
#</Group>

#Rules only for group ftpnolimit
#<Group ftpnolimit>
#       Download                0       #0 = unlimited
#       IdleTimeOut             0       #no timeout
#       DirFakeUser             false   #show real user on file/directory
#       DirFakeGroup            false   #show real group on file/directory
#       DirFakeMode             0       #show real rights on file/directory
#       MaxReadFilesForUser     0       #0 = unlimited but still have the restriction MaxOpenFilesForUser
#</Group>

#<IpRange 192.168.0.1-192.168.0.5>
#       ByPassGlobalDownload    true    #bypass GlobalDownload restriction
#       ByPassGlobalUpload      true    #bypass GlobalUpload restriction
#       Download                0
#       DisableAccount          false   #enable account
#       IdleTimeOut             0       #disable timeout
#       LimitConnectionByIP     0       #no limit
#</IpRange>

#<Group trusted_users>
#       Shell           /bin/tcsh       #give a shell access to TRUSTED clients !!!
#</Group>

#<VirtualHost *:22>
#       DirFakeUser     false   #show real user on file/directory
#       DirFakeGroup    false   #show real group on file/directory
#       DirFakeMode     0       #show real rights on file/directory
#       HideNoAccess    false
#       IgnoreHidden    false
#</VirtualHost>

#Include /etc/my_sftp_config_file       #include this valid configuration file

[root@alarmpi ~]# cat /etc/ssh/sshd_config
#       $OpenBSD: sshd_config,v 1.90 2013/05/16 04:09:14 dtucker 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 override the
# default value.

#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#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
#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

# Ciphers and keying
#RekeyLimit default none

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

# Authentication:

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

#RSAAuthentication yes
#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile      .ssh/authorized_keys

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody

# 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 no

# Kerberos options
#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

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
PrintMotd no # pam does that
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
UsePrivilegeSeparation sandbox          # Default for new installations.
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# override default of no subsystems
# Subsystem     sftp    /usr/lib/ssh/sftp-server
Subsystem sftp /bin/MySecureShell -c sftp-server

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

[root@alarmpi ~]# sftp-verif

################################################################################
                        MySecureShell Verification Tool
################################################################################

### Verifing file existance ###

/usr/bin/MySecureShell                                                   [ OK ]
/usr/bin/sftp-who                                                        [ OK ]
/usr/bin/sftp-kill                                                       [ OK ]
/usr/bin/sftp-state                                                      [ OK ]
/usr/bin/sftp-admin                                                      [ OK ]
/usr/bin/sftp-verif                                                      [ OK ]
/usr/bin/sftp-user                                                       [ OK ]


### Verifing rights ###

Verifing file rights of /etc/ssh/sftp_config                             [ OK ]
Verifing file rights of /usr/bin/sftp-who                                [ OK ]
Verifing file rights of /usr/bin/sftp-verif                              [ OK ]
Verifing file rights of /usr/bin/sftp-user                               [ OK ]
Verifing file rights of /usr/bin/sftp-kill                               [ OK ]
Verifing file rights of /usr/bin/sftp-state                              [ OK ]
Verifing file rights of /usr/bin/sftp-admin                              [ OK ]
Verifing file rights of /usr/bin/MySecureShell                           [ OK ]


### Verifing rotation logs ###

Rotation logs have been found                                            [ OK ]


### Verifing server status ###

Verifing server status (ONLINE)                                          [ OK ]


### Verifing server dependencies ###

Show only error(s) :


### Verifing server configuration ###

Show only error(s) :
Trying user: root
Checking user : karolina
Checking user : marca
Checking user : guest


### All tests dones ###

Status:    Connecting to 192.168.1.2...
Response:    fzSftp started
Command:    open "guest@192.168.1.2" 22
Command:    Pass: *****
Error:    Authentication failed.
Error:    Critical error
Error:    Could not connect to server