sshfs giving "remote host has disconnected"
Solution 1
Your Subsystem
value in sshd_config
is wrong.
It should be Subsystem sftp /usr/lib/openssh/sftp-server
or internal-sftp
. Try to modify the /etc/ssh/sshd_config
to this value, restart the ssh service ans try once more.
Solution 2
Old question, but the first one that comes up for this problem.
My issue was the server required key authentication, but I was running the command using sudo
and specifying -o IdentityFile=~/.ssh/id_rsa
, meaning ~
was expanded to root's home, not mine.
Specifying the full path worked, and I imagine using $HOME
would have too (because it would have expanded earlier).
Solution 3
You'll get this error if the remote server is running Dropbear rather than OpenSSH.
SSHFS uses SFTP, and Dropbear doesn't provide SFTP. So when you try to use it, the Dropbear server sees a request for a subsystem that it doesn't understand and drops the connection.
Solution 4
I am not sure if it helps, but I had similar problem
remote host has disconnected
and after some googling&browsing I realised, that actually I connected ssh via different port.
So, for example, I had to connect via ssh (example, assuming port number 1234):
ssh [email protected] -p 1234
instead of standard ssh when port number is 22. So the same had to be used for sshfs connection:
sshfs [email protected]:/ ~/testfolder -p 1234
It solved my problem.
Solution 5
One more cause that happened to me was that the dropbearmulti
binary itself lacked the string /usr/libexec/sftp-server
which got lost somewhere around build 33600 of DD-WRT. Check if said binary mentions this file or it won't work even if it's present. I had to use a binary from build 33525 and make a launcher that kills the normal buggy dropbear, then runs this one. You create a symlink called dropbear
pointing to dropbearmulti
. You stop the current one with stopservice sshd
, then run the working one. See in ps
what the proper parameters look like.
It's best to have it on jffs (or unpack it to /tmp) so that you could still umount
any drive.
Related videos on Youtube
Slava Knyazev
Updated on September 18, 2022Comments
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Slava Knyazev over 1 year
I am trying to mount an
sftp
connection into a folder usingsshfs
with the following command which throws an error.~$ sshfs [email protected]:/ testfo remote host has disconnected
The same error happens if I SSH into the system and repeat the command by with
localhost
. This command also worked with another machine so therefore the issue 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 debugging attempt for a similar issue.Additional information for future reference:
The issue 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 present from all users (including root).
Here is my sshd configuration (
/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
package is installed. (sudo apt-get install openssh-sftp-server
)-
Slava Knyazev almost 8 years@Jakuje Hmm.. the issue seems to be in fact with sftp. Trying with filezilla gives
Received unexpected end-of-file from SFTP server
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Jakuje almost 8 years2) Can you
sftp
to different users? 3) How does yousshd_config
on server look like? 4) How does your~/.bashrc
look like? -
Slava Knyazev almost 8 years@Jakuje Same 2) Nope.. Same error for all users. 3) pastebin.com/raw/ujNk3fVR 4) bashrc got nothing of relevance but here: pastebin.com/raw/mUD3DWmG
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Jakuje almost 8 yearsWhat you get from
which sftp-server
. Subsystem should beSubsystem sftp /usr/lib/openssh/sftp-server
. Do you havesftp-server
installed?apt-get install openssh-sftp-server
. -
Slava Knyazev almost 8 years@Jakuje
openssh-sftp-server
is installed, however the which command returns nothing. -
Slava Knyazev almost 8 years@DavidFoerster Done!
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Edd Barrett almost 5 yearsThis can happen if the host key of the server has changed. Try a regular ssh connection and look for errors.
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Slava Knyazev almost 8 yearsYes I am able to ssh to it. "The same error happens if I SSH into the system[..]" Implied it. Server is setup correctly as far as I know
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Christopher Angulo-Bertram almost 8 yearsOK, I may be miss reading your comment, were you successfuly able to login with ssh, or as I read here: "The same error happens if I SSH into the system[..]"
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Slava Knyazev almost 8 yearsI can ssh to it just fine
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Christopher Angulo-Bertram almost 8 yearsOK, looking at your command line maybe you have an extra space? I found this one on line I will send you the link. sshfs <username>@<ipaddress>:/remotepath ~/remoteserv I found it here: howtogeek.com/howto/ubuntu/… There are a bunch of other instructions but in your original question your command seems to have an extra space
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Christopher Angulo-Bertram almost 8 yearsI also do not see where you are connecting to your local system as a directory. Your code my code to follow: sshfs [email protected]:/ testfo
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Christopher Angulo-Bertram almost 8 yearsMy code: sshfs <username>@<ipaddress>:/remotepath ~/remoteserv
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Christopher Angulo-Bertram almost 8 yearsDo you see the extra space before testfo in your command?
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David Foerster almost 8 yearsThe Stack Exchange network sites are very strict on the distinction between answers providing solutions, and comments. Comments showed up as a origin of spam, and heavy discussions not fitting the Stack Exchange model – this is why some reputation is required for posting them, showing you got familiar with the site's idea. This is not meant for annoying new users, but keeping the site's quality high. (See Why and how are some answers deleted?)
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Bemmu over 4 yearsThanks, was able to mount with this tip.
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Jamaluddin Rumi over 3 yearsthank you very much. it works :)