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• setting nproc in /etc/security/limit.conf prevents ssh login

  - by omry

  I am trying to use /etc/security/limit.conf on Linux (Debian) to limit the number of processes per user. for starters, I tried to limit my own user processes by adding this to /etc/security/limit.conf: omry hard nproc 100 this locked my user out of ssh. I could open new processes (verified with su omry), but could not log into ssh with that user : sshd reported this in it's log: fatal: setreuid 1000: Resource temporarily unavailable also, I am certain my user is not running anything near 100 processes (actually 6). what can be the reason for this?

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• How can I restrict SSH access when the source IP is dynamic

  - by Supratik

  Hi I want to protect SSH access to our live web server from all IP's except our office static IP. There are some employees who connects to this live server from their dynamic IP's. So, it is not always possible for me to change in the iptables rule in live server whenever the dynamic IP of the employee changes. I tried to put them in office VPN and allowed only SSH access from office IP but the office connection is slow in compared to our employee's private internet connection, moreover it adds an extra overhead to our office network. Is there any way I can solve this problem ?

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• SSH command from PHP script - nothing, yet work at cmd line

  - by waxical

  I'm working on an EC2 box and trying to SSH command another box. The command works in command-line, even php -a interactive. However it does not work when running as apache. Example cmd:- system('ssh -i /home/me/keys/key.pem [email protected] "ls"'); I've tried adding apache to wheel group, and gshadow on both boxes. I've also just tried chowning the pem file to apache. Nothing. Yet the command response fine in the two other use cases outlines. What's going on here? Anyone know?

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• SSH tunneling and NAT

  - by thonixx

  I have a virtual machine with an internal IP address and a running mailserver with IMAP/POP3/SMTP. Everything works fine except: When I do an SSH tunnel to the guest server and want to connect to the mailserver with mail.*. then it does not work. There is a connection timeout. But If i connect to the internal IP 192.168..* then it works. So what can I do to enable the access from the domain name to the virtual machine with SSH tunneling?

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• Cannot ssh anymore into FreeBSD 7.2 home server

  - by Gabi

  Somehow sshd stopped running and no amount of start, restart or onestart will make it go again. I normally ssh into it from a dual-boot laptop computer that shows up on the network as gabi-buntu when running Ubuntu Karmic, and as gabi-pc when running Windows XP Pro. Neither my Putty connection nor the Linux terminal can establish a ssh link anymore. Upon rebooting the server, I am greeted with "/etc/rc: WARNING: run_rc_command: cannot run /usr/sbin/sshd". In addition, a message will appear saying things like rpc.statd: failed to contact host gabi-buntu RPC: port mapper failure RPC: timed out Everything else works fine. The FreeBSD 7.2 box runs a print server, a Samba server, and an Apache server for the home wiki, via https. It also serves up NFS shares for Linux clients. Any suggestions? Thank you, Gabi Huiber

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• can not connect via SSH to a remote Postgresql database

  - by tartox

  I am trying to connect via pgAdmin3 GUI to a Postgresql database on a remote server myHost on port 5432. Server side : I have a Unix myUser that match a postgresql role. pg_hba.conf is : local all all trust host all all 127.0.0.1/32 trust Client side : I open an ssh tunnel : ssh -L 3333:myHost:5432 myUser@myHost I connect to the server via pgAdmin3 ( or via psql -h localhost -p 3333 ). I get the following error message : server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. I have tried to access a specific database with the superuser role using psql -h localhost -p 3333 --dbname=myDB --user=mySuperUser with no more success. What did I forget in the setup ? Thank you

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• Debian: SSH: "PermitRootLogin=forced-commands-only" stopped working

  - by Brent

  I have several servers running Debian Lenny. Just recently I discovered the PermitRootLogin=forced-commands-only directive for ssh, which allows me to run a scripted rsync as root with an ssl key, without enabling more generalized root ssh access. However, last week this stopped working - it appears on all of my servers - and I can't figure out why. Everything continues to work fine with PermitRootLogin=yes, but I would prefer to block root logins - especially via passwords. The day it stopped working, we reconfigured some of the ports on one of our switches (which we later reverted), but I can't see that affecting this, since it still works with PermitRootLogin set to yes. How can I diagnose why the forced-commands-only directive has apparently stopped working?

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• sudo su - username while keeping ssh key forwarding

  - by Florian Schulze

  If I have a server A into which I can login with my ssh key and I have the ability to "sudo su - otheruser", I lose key forwarding, because the env variables are removed and the socket is only readable by my original user. Is there a way I can bridge the key forwarding through the "sudo su - otheruser", so I can do stuff on a server B with my forwarded key (git clone and rsync in my case)? The only way I can think of is adding my key to authorized_keys of otheruser and "ssh otheruser@localhost", but that's cumbersome to do for every user and server combination I may have.

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• SSH Tunneling for Munin

  - by Dennis Wisnia

  I had at home an NAS and in the datacenter a Server. I make an SSH Tunnel with the following command: autossh -fN -M20404 -R 1337:localhost:22 user@server (from the nas to the server) Its working and I can access the NAS. Now, I want access the munin-node, also I make a new tunnel from the server to the nas: ssh -N -R 49499:localhost:4949 localhost -p 1337 but if I make an nmap localhost -p 49499 the port is closed and i cant access the munin-node. I don't know why and I am very happy about your help.

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• How to display SSH banner at login, but only for password authentication

  - by banjer

  I have a warning message that is displayed to a user after they enter their username to log in to our Linux servers. I only want to display this message for password authentications, and not when keys are used. It should only show to a user who is logging into a host, and not when they are sshing from one host to another (our hosts all have keys set up so we can ssh from one to another without entering passwords). Currently, I have a line for Banner in the /etc/ssh/sshd_config file which points to a text file containing the warning message. Banner doesn't appear to have any further config options, so I'm wondering if there is a way to do this with pam or some other mechanism? Thanks.

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• Linux - Block ssh users from accessing other machines on the network

  - by Sam

  I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall on my W7 pcs to ignore any connection attempts from the Virtual Machine, but would like to go a step further and not allow any network access from the VM to other machines on my network. Team members will be access the VM by SSH. The only external port forwarded is to vm:22. The VM is running in VirtualBox on a bridged network connection. Running latest Debian. If someone could tell me how to do this I would be much obliged.

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• SSH authentication working unless ran from script??

  - by awright418

  I have set up my server to allow key/pair authentication by following instructions similar to what is found in this post. As far as I can tell that is working correctly. If I do the following, for example, it works correctly: ssh [email protected] It will NOT prompt me for a password. This is what I want to happen. However if I write a small bash script like this: #!/bin/bash -x ssh [email protected] and execute with: sudo ./mytestscript.sh ...it will prompt me with: [email protected]'s password: What am I doing wrong? I need to be able to login from within my script without being prompted for a password!

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• Can't open an SSH session because of OpenSSL version mismatch [on hold]

  - by user3287849

  I just ran apt-get upgrade, and according to /var/log/apt/history.log, openssl has been updated to version 1.0.1e-2+rvt+deb7u7. Now I have one SSH session still open, but I can't open another one. I restarted SSH, which returned OpenSSL version mismatch. Built against 1000105f, you have 10001080. I tried apt-get remove openssl && apt-get install openssl with no luck. I'm running debian on a raspberry pi. Edit: moved to SuperUser

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• How can I make a persistent ssh tunnel?

  - by Blacklight Shining

  I have a Mac laptop and would like to have a persistent ssh tunnel so I can always log in from outside the local network. I'm looking for something that will work when the server can't be reached initially (e.g. if I don't have an Internet connection when I boot it), and will automatically start the tunnel when possible. I've tried putting an @reboot autossh line in my crontab, but I've found that sessions started with autossh disconnect every so often, and autossh quits if the first attempt fails. My current workaround is a small script and a cronjob: # crontab /home/blackl/bin/script &! # script #!/bin/sh while true; do ssh -Ngn -R $some_port:localhost:22 $server; sleep 30; done; Is there a better way to do this, or will I just have to be happy with this for now?

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• SSH and Latent Connections (e.g., satellite connections)

  - by user71494

  Most of the week I live in the city where I have a typical broadband connection, but most weekends I'm out of town and only have access to a satellite connection. Trying to work over SSH on a satellite connection, while possible, is hardly desirable due to the high latency ( 1 second). My question is this: Is there any software that will do something like buffering keystrokes on my local machine before they're sent over SSH to help make the lag on individual keystrokes a little bit more transparent? Essentially I'm looking for something that would reduce the effects of the high latency for everything except for commands (e.g., opening files, changing to a new directory, etc.). I've already discovered that vim can open remote files locally and rewrite them remotely, but, while this is a huge help, it is not quite what I'm looking for since it only works when editing files, and requires opening a connection every time a read/write occurs. (For anyone who may not know how to do this and is curious, just use this command: 'vim scp://host/file/path/here)

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• How do i allow users to execute commands via ssh without allocating a psuedo-terminal

  - by Dani El

  I need to allow users to run a limited set of commands. But not to allow them to create interactive sessions. Just like GitHub does. If you try to ssh without a command it greetings you and close the session. I can acquire this by using ForceCommand some-script But getting in some-script i then need to eval user's input. Perhaps any other NoTTY-like option in sshd_config? --- UPDATE --- i'm looking for a pure SSH / Bash solution, not Perl/Python/etc. hacks.

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• SSH rsa key works with external IP not internal IP

  - by Ian

  I am using rackspace cloud hosting. I have 2 servers behind a load balancer. Each server has an external IP and an internal IP. I want to setup a sync job that uses SSH to transfer files. I made an rsa key, and I can successfully SSH from server A into server B, using the external IP of server B, without being prompted for a password. If I try to do the same but use the internal IP, it prompts me for a password. I want to be able to use the key instead of the password. Why is this? Is there something special I have to do during key generation so it works for both IPs? Any help is appreciated.

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• How to secure svn+ssh checkout users?

  - by vvanscherpenseel

  All our SVN repositories are hosted on a dedicated machine on which all the developers have access. Every now and then we need to checkout a repository on a machine we don't own or operate ourselves. Currently we all use our own system (SSH) account for this, but instead I would like to use some generic 'checkoutsvn' user that can be used for this. This user is only used for checking out from a repository, but should not be allowed to log in to the system (no shell access). I tried to do this by setting the default shell of that account to /sbin/nologin but then SVN fails, as apparently svn+ssh requires shell access. How do you do this? Is there a good solution for this?

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• How do I allow users to execute commands via ssh without allocating a pseudo-terminal

  - by Dani El

  I need to allow users to run a limited set of commands. But not to allow them to create interactive sessions. Just like GitHub does. If you try to ssh without a command it greetings you and close the session. I can acquire this by using ForceCommand some-script But getting in some-script i then need to eval user's input. Perhaps any other NoTTY-like option in sshd_config? --- UPDATE --- i'm looking for a pure SSH / Bash solution, not Perl/Python/etc. hacks.

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• SSH without portforward

  - by maigel

  I have a raspberry pi lying around in my dorm room. It's connected to campus internet which has all ports closed and I obviously don't have any access or permission to port forwarding. Now I want to ssh to the raspberry pi but this isn't possible since I can't port forward. I do however have a cheap vps doing nothing. Is there a way to make the pi connect to the vps and then use the vps as some sort of tunnel to ssh to the raspberry pi without having any port forwarding done?

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• putty ssh client become not responding frequently in windows 7

  - by Sankaran

  with celeron processor and 512 MB ram windows 7 takes too much time even to open a folder in windows explorer. I connect to internet with GPRS modem. When I tried to connect with remote linux machine with putty ssh client. The problem is the putty becomes Not responding in 2 or 3 minutes. I've to connect again and putty goes Not responding again. When i tried in Safe mode with networking, GPRS modem is not even detected. the modem is USB data card. Is it possible load USB drive in safe mode of windows 7 or any other possibility to connect with remote machine via ssh

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• Unix Shell/SSH config to allow TCP port forwarding without showing a command prompt

  - by Raphael K

  I'm running a Debian Linux. I'd like to have a user account that is able to connect via SSH for TCP-forwarding only, without a command prompt. e.g the following would work (from a remote computer): ssh -D1234 user@myhost but no command prompt would appear. Using a shell like /bin/false or /sbin/nologin is too restrictive as it doesn't even allow the user to log in. A shell that only allows the "exit" or Ctrl+D commands would do the job. I know that something similar is possible to allow only SFTP, but I can't find the equivalent for TCP forwarding. Thanks

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• Sending files through ssh

  - by Frion3L

  I need to send files to a server using ssh. I have never used ssh so this is being really frustrating to me. Mention the client (me) is using windows and the server is using Ubuntu. I connected to the server using ssh2 ip, and then loging with an account I have. Now, I would like to send my files to a folder in the server, so, I moved to the folder and I used this command: scp test.txt user_name@host_direction server_folder_destination And it always return that it can't do 'stat' over test.txt, the file doesn't exist, and so. I'm assuming ssh2 can't see the file in my computer root (C:), so I tried to specifie more and added: C:\test.txt, but apear the same error. I don't know what is happening. Any hints please? Thanks

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• SSH disconnects active session after 20 minutes

  - by Paramaeleon

  I’ve just set up a new Linux box (OpenSuSE 12.3 on VmWare). Now I stated that my SSH shell sessions are disconnected exactly after 20 minutes, clearly with activity. (Putty: “Network error: Software caused connection abort”) I already set Putty to send keep alives every 64 sec. In sshd_config, I set ClientAliveInterval 50 ClientAliveCountMax 2 and did a deamon reload. Didn’t help. About two minutes after the link breakdown, ssh reports to /var/log/messages: … … sshd[…]: Timeout, client not responding. … … sshd[…]: pam_unix(sshd:session): session closed for user root I don’t encounter this behaviour when connecting to other virtual machines, so I guess the problem isn’t in the network. Any help is appreciated.

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• SSH and Latent Connections (e.g., satellite connections)

  - by user71494

  Most of the week I live in the city where I have a typical broadband connection, but most weekends I'm out of town and only have access to a satellite connection. Trying to work over SSH on a satellite connection, while possible, is hardly desirable due to the high latency ( 1 second). My question is this: Is there any software that will do something like buffering keystrokes on my local machine before they're sent over SSH to help make the lag on individual keystrokes a little bit more transparent? Essentially I'm looking for something that would reduce the effects of the high latency for everything except for commands (e.g., opening files, changing to a new directory, etc.). I've already discovered that vim can open remote files locally and rewrite them remotely, but, while this is a huge help, it is not quite what I'm looking for since it only works when editing files, and requires opening a connection every time a read/write occurs. (For anyone who may not know how to do this and is curious, just use this command: 'vim scp://host/file/path/here)

  Read the article

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