I am trying to mount an sftp connection into a booklet using sshfs with the following command which throws an error .

~$ sshfs admin@example.com:/ testfo
remote host has disconnected

The same erroneousness happens if I SSH into the system and repeat the command by with localhost. This command besides worked with another machine so consequently the offspring is somewhere on the server .

~$ cat /var/log/auth.log

[...]

May 24 22:49:43 example sshd[20095]: Accepted publickey for admin from 24.111.222.33 port 47086 ssh2: RSA ad:xx:6e:xx:14:xx:bd:b5:xx:cb:66:xx:xx:xx:a3:ac
May 24 22:49:43 example sshd[20095]: pam_unix(sshd:session): session opened for user admin by (uid=0)
May 24 22:49:43 example systemd-logind[812]: Removed session 60.
May 24 22:49:43 example systemd-logind[812]: New session 61 of user admin.
May 24 22:49:44 example sshd[20143]: Received disconnect from 24.203.164.45: 11: disconnected by admin
May 24 22:49:44 example sshd[20095]: pam_unix(sshd:session): session closed for user admin

The ~/.ssh directory is owned by admin since I saw that as a debug attack for a similar issue .
extra information for future address :

The return is not with SSH itself, but with SFTP. This is manifested by the fact that SSH connections work correctly but SFTP always fails. Attempting to SFTP results in Received unexpected end-of-file from SFTP server

The issue is not related to login scripts outputted strings ( e.g. ~/.bashrc ).

The issue is give from all users ( including root ) .
here is my sshd shape ( /etc/ssh/sshd_config ) :

# Package generated configuration file
# See the sshd_config(5) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# 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
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys

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

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes

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

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp sftp-server

# 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

sftp-server box is installed. ( sudo apt-get install openssh-sftp-server )

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