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• Why does ssh hang after "debug1: loaded 3 keys"

  - by James Moore

  Trying to log in to an Amazon EC2 instance running Ubuntu 10.04.1. I can log in just fine, no issues. A different user, coming from a different network just gets this: OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to xxxx [xxxx] port 80. debug1: Connection established. debug1: identity file /.ssh/identity type -1 debug1: identity file /.ssh/id_rsa type -1 debug1: identity file /.ssh/id_dsa type -1 debug1: loaded 3 keys And then it hangs. We've tried running sshd on port 22 and port 80 I'm guessing that it's not a firewall problem since the verbose output reports that the connection is established. I don't see anything in /var/log/auth.log when the failing user connects. I do see entries when I log in successfully.

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• Cygwin, ssh, and git on Windows Server 2008

  - by Paul

  Hi everyone. I'm trying to setup a git repository on an existing Windows 2008 (R2) server. I have successfully installed Cygwin & added git and ssh to the packages, and everything works perfectly (thanks to Mark for his article on it). I can ssh to localhost on the server, and I can do git operations locally on the server. When I try to do either from the client, however, I get the "port 22, Bad file number" error. Detailed SSH output is limited to this: OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007 debug1: Connecting to {myserver} [{myserver}] port 22. debug1: connect to address {myserver} port 22: Attempt to connect timed out without establishing a connection ssh: connect to host {myserver} port 22: Bad file number Google tells me that this means I'm being blocked, usually, by a firewall. So, double-checked the firewall settings on the server, rule is there allowing port 22 traffic. I even tried turning off the firewall briefly, no change in behavior. I can ssh just fine from that client to other servers. The hosting company swears that there's no other firewalls blocking that server on port 22 (or any other port, they claim, but I find that hard to believe). I have another trouble ticket into them, just in case the first support person was full of it, but meanwhile I wanted to see if anyone could think of anything else it can be. Thanks, Paul

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• So Close: How to get this SSH login working (.bashrc)

  - by This_Is_Fun

  Objective: SSH login ( + eliminate warning message) / run 2 commands / stay logged in: EDIT: Oops, I made a mistake (see below): This code does ~95% of what I wanted to do # .bashrc # Run two commands and stay logged in to new server. alias gr='ssh -t -p 5xx4x [email protected] 2> /dev/null "cd /var; ls; /bin/bash -i"' Now, after successful login / verify user logged in = root pts/0 2011-01-30 22:09 Try to 'logout' = bash: logout: not login shell: use `exit' I seem to have full root access w/o being logged into the shell? (The " /bin/bash -i " was added to 'Stay logged in' but doesn't work quite as expected) FYI: The question is "How to get this SSH login working" & it is mostly solved, sorry I made a mess... ... .. . Original Question Here: # .bashrc # Run two commands and stay logged in to new server. alias gr='ssh -t -p 5xx4x [email protected] "cd /var; ls; /bin/bash -i"' # (hack) Hide "map back to the address - POSSIBLE BREAK-IN ATTEMPT!" message. alias gr='ssh -p 5xx4x [email protected] 2> /dev/null' Both examples 'work' as shown; When I try to add the ' 2 /dev/null ' to the first example, then the whole thing breaks. I'm out of time trying to solve the warning message other ways, so is it possible to combine both examples to make example #1 work w/o the warning message? Thank you. ps. If you also know a proper way to kill the login warning message, please do tell (the 'standard' "edit host file" advice isn't working for me)

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• ssh X11 forwarding issue

  - by bbuser

  I have put ForwardX11 in my ~/.ssh/config and then I start a X11 application like this: ssh -f user@host 'someapp; sleep 1' This works fine. The application someapp has a button which opens a viewer application via a shell script viewer.sh. When I press the button the viewer comes up. This is all good and as expected, but if I do ssh -2 -f user@host 'someapp; sleep 1' there's trouble. someapp starts very well, but if I click the button the viewer doesn't show up. As the viewer is called via a shell script, I replaced the call with xclock and the situation was exactly the same - I think the viewer is not to blame. The situation is the same on Linux and AIX. The reason I need -2 is that I finally want to use connection multiplexing and this does only work with version 2. The reason for the sleep 1 is that it didn't work otherwise;-) To add more confusion, with ssh -2 -f user@host 'xterm &; app; sleep 1' the viewer works as long as the xterm is open. When I close xterm ssh -v outputs the following debug1: channel 1: FORCE input drain debug1: channel 0: free: client-session, nchannels 3 debug1: channel 1: free: x11, nchannels 2 and from that moment the viewer doesn't show when I press the button. I also replaced the viewer application with a script that writes the $DISPLAY variable to a file. The variable is always set correctly.

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• Cannot connect to server via SSH

  - by Rayne

  I'm running RHEL 6.0, and I accidentally moved the /bin, /boot, /cgroup, console.txt, /data, /dev, /etc to another folder. I think I managed to move these folders back, but now I'm having trouble connecting to the server using SSH, but am able to access the server via VNC. When I tried to connect to the server using a terminal from another server, I get the error ssh_exchange_identification: Connection closed by remote host I'm currently still connected via SSH to the server (haven't closed the window yet), and am still able to access it normally. But if I try to open a new SSH terminal from my current session, I see /bin/bash: Permission denied If I try to open a new SSH File Transfer window from my current session, I get the error File transfer server could not be started or it exited unexpectedly. Exit value 0 was returned. Most likely the sftp-server is not in the path of the user on the server-side I checked and I have Subsystem sftp /usr/libexec/openssh/sftp-server which is the same path as the output of locate sftp-server Also, when I tried to restart sshd, I get the error Couldn't open /dev/null: Permission denied But my /dev/null has the permissions crw-rw-rw- for root,root. How can I resolve this? ETA: Thanks for all your help! I was able to start ssh by running the application directly /usr/sbin/sshd Even though the status of the openssh-daemon is still "stopped".

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• Windows CA to issue certificate to authenticate SSH to a Linux server

  - by BArnold

  I have a Windows Server Root Certificate Authority, Linux SSH server, and users with Windows SSH clients. The Linux box is not part of the AD domain (and probably never will be [sigh]) OpenSSH 5.4 and above supports X.509 certiicate based authentication. I am trying to find a way to use my Windows Certificate Authority to issue certificates for authentication of the users when the SSH to the Linux box. I do not want to have to generate a keypair on each user's desktop. And we want the certificates controlled and revokable at the Windows CA. My question is not exactly the same as SSH from Windows to Linux with AD certificates (and the referenced moelinux.net seems to be down) I have searched Google a lot, and haven't found much results about how to accomplish this. An answer doesn't necessarily have to include a full tutorial, even some hints about what to search on or pointers to some references may be helpful.

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• sequential SSH command execution not working in Ubuntu/Bash

  - by kumar

  My requirement is I will have a set of commands that needs to be executed in a text file. My Shell script has to read each command, execute and store the results in a separate file. Here is the snippet which does the above requirement. while read command do echo 'Command :' $command >> "$OUTPUT_FILE" redirect_pos=`expr index "$command" '>>'` if [ `expr index "$command" '>>'` != 0 ];then redirect_fn "$redirect_pos" "$command"; else $command state=$? if [ $state != 0 ];then echo "command failed." >> "$OUTPUT_FILE" else echo "executed successfully." >> "$OUTPUT_FILE" fi fi echo >> "$OUTPUT_FILE" done < "$INPUT_FILE" Sample Commands.txt will be like this ... tar -rvf /var/tmp/logs.tar -C /var/tmp/ Commands_log.txt gzip /var/tmp/logs.tar rm -f /var/tmp/list.txt This is working fine for commands which needs to be executed in local machine. But When I am trying to execute the following ssh commands only the 1st command getting executed. Here are the some of the ssh commands added in my text file. ssh uname@hostname1 tar -rvf /var/tmp/logs.tar -C /var/tmp/ Commands_log.txt ssh uname@hostname2 gzip /var/tmp/logs.tar ssh .. etc When I am executing this in cli it is working fine. Could anybody help me in this?

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• Requiring SSH-key Login From Specific IP Ranges

  - by Sean M

  I need to be able to access my server (Ubuntu 8.04 LTS) from remote sites, but I'd like to worry a bit less about password complexity. Thus, I'd like to require that SSH keys be used for login instead of name/password. However, I still have a lot to learn about security, and having already badly broken a test box when I was trying to set this up, I'm acutely aware of the chance of screwing myself while trying to accomplish this. So I have a second goal: I'd like to require that certain IP ranges (e.g. 10.0.0.0/8) may log in with name/password, but everyone else must use an SSH key to log in. How can I satisfy both of these goals? There already exists a very similar question here, but I can't quite figure out how to get to what I want from that information. Current tactic: reading through the PAM documentation (pam_access looks promising) and looking at /etc/ssh/sshd_config. Edit: Alternatively, is there a way to specify that certain users must authenticate with SSH keys, and others may authenticate with name/password? Solution that's currently working: # Globally deny logon via password, only allow SSH-key login. PasswordAuthentication no # But allow connections from the LAN to use passwords. Match Address 192.168.*.* PasswordAuthentication yes The Match Address block can also usefully be a Match User block, answering my secondary question. For now I'm just chalking the failure to parse CIDR addresses up to a quirk of my install, and resolving to try again when I go to Ubuntu 10.04 not too long from now. PAM turns out not to be necessary.

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• SSH into VirtualBox Guest: Connection Refused

  - by Eric J.

  Setup Windows 7 64-bit host OS running VirtualBox 4.2, with Ubuntu 12.04 guest OS. OpenSSH server is installed and running (ssh -v localhost connects locally in the guest machine). Can SSH to external servers (no outbound Windows firewall rule blocking port 22) Can ping the IP of the guest (192.168.56.101) Problem Using PuTTY to SSH to the IP of the guest OS (192.168.56.101), PuTTY returns almost immediately with Network error: connection refused How can I diagnose & resolve this issue?

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• Unable to setup ssh tunnel on mac

  - by prashant

  On my office windows XP laptop I use a program called Bitvise Tunnelier to establish ssh tunnel to a in-house MySQL database. In the Tunnelier program I also need to provide address of corporate http proxy server in order to establish tunnel. On my personal mac laptop, I use Cisco Anywhere client to establish a VPN connection to my corporate network. But i'm unable to establish ssh tunnel to mysql database using ssh. How do I specify the proxy server address in the ssh command? As additional info when i'm using office laptop (whether in home or office) I can successfully ping to the server address specified in the Tunnelier program. But i cannot ping the same server using my mac machine (even after connecting via VPN). So basically i'm unable to understand what's going on and what steps i can take to debug this problem .

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• SSH via DHCP server

  - by SFault

  I have a DHCP server setup and I can't seem to connect to anything through SSH. When I'm logged in to the server itself, I can SSH. But when I connect any machine to the DHCP server, that machine can SSH but every server I SSH to asks for a password when the normal behavior (when not connected to the DHCP server) does not. Here are the contents of my iptables script that are related to port 22. $IPT -t nat -A PREROUTING -i $LAN -p tcp --dport 22 -j REDIRECT --to-port 22 $IPT -A FORWARD -i $LAN -p tcp --dport 22 -j ACCEPT $IPT -A INPUT -i $LAN -p tcp --dport 22 -j ACCEPT $IPT -A INPUT -i $WAN -p tcp --dport 22 -j ACCEPT $IPT -A OUTPUT -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT $IPT -A INPUT -i $LAN -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT Am I missing something?

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• ssh - no route to host

  - by cupakob

  I have 3 machines (A, B and C) behind WLAN Router. From B i can make ssh to A and from A to B also. Ssh between C and A is also working (both destination, C-A and A-C). But when i try to connect B to C or C to B i get always ssh: connect to host <HOST> port 22: No route to host What can be the reason for this error?

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• What ssh command would I use to set up "backwards listening"

  - by Nathan

  Machine A is behind a firewall. I have physical access to it, but I want to log into it remotely, and I do not have access to the firewall settings. Machine B is remote, and not behind any firewall. (It's my linode) Machine C is the mobile device I'm going to attempt to ssh into A from. Is there an ssh command that I can run from machine A that connects to machine B and stays open, that will allow me to log into A from C, via B? From the manual I'd guess it would be to run the follwing on A ssh -R *:9999:localhost:22 me@B and then run this on C ssh me@B -p 9999 but the previous command reports "Connection refused."

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• ssh auto-forward?

  - by Jakobud

  I'm not sure if there is a specific name for this type of activity or not, but anyways: When a user ssh's into machine1, is there someway to force them to automatically ssh to machine2? For example, if user Bob ssh's into server1, can you set something up on server1 so that when Bob successfully logs in, he automatically ssh's to server2, so that he only has access to server2 and isn't really able to do anything on server1? Also, when he exits, it would disconnect him from server2 but also server1. Does that make sense? Is that possible?

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• How to access an IP address as if on a different network using SSH

  - by NT3RP

  In preparation for a lengthy business trip, I set up my router such that I can access my home computer over the internet via port forwarding over SSH. One thing I neglected to do was setup access to my router remotely. Normally, I can just access the router configuration page via 192.168.1.1. I know that it's possible to tunnel traffic through SSH, but how do I access an IP address as if I were on my home network using SSH?

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• Accessing a persistent ssh tunnel

  - by woowaa

  How do I pass commands (shell) to a persistent SSH tunnel rather than open a connection for every instance? I have a Python scraper running on a client server which passes URL variables and shell commands to a remote host via a reverse tunnel (forwarded port), so that the URL's are then executed on the host (python fabric ssh localhost:12345 'browser open URL'). I could make the reverse tunnel persistent but how do I echo the url/command to the session? Update - ControlMaster (built into SSH) solves this one.

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• Ubuntu to Ubuntu VNC over SSH tunnel

  - by rxt

  I have a Linux Ubuntu desktop at home, ssh enabled, vnc server installed, router rule configured. It all works, and at home I can connect via the local network from my Mac. From the outside I can login via ssh. I've configured putty as follows: session: host name and port number connection ssh tunnel: forwarded ports: L5900|192.168.0.23 the local address is: 192.168.1.45 When I make the connection I can login to the remote machine. Then I open Remote Desktop Viewer. I click connect protocol: vnc host: ? use host as ssh tunnel: ? I don't know what to use for the last two options. Which ip-addresses should I use?

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• SSH login to Cisco switch using Rancid times out

  - by Lars

  I have a 3560 switch that I have configured to accept SSH logins, and this works fine. However I cannot get Rancid to complete the login process to any of my switches using SSH. I get a timeout error after a minute or so. Telnet logins work fine with the same username and password. Here is my rancid setup in .cloginrc: add user * {myuser} add password * {strongAccessPassword} {strongEnablePassword} add method * ssh telnet Then, when I run bin/clogin 10.10.1.10 I get: # bin/clogin 10.10.1.10 10.10.1.10 spawn ssh -c 3des -x -l myuser 10.10.1.10 ############################################### Please authenticate. ############################################### Password: Error: TIMEOUT reached Again, when I do this using telnet as my preferred mothod in .cloginrc, it works without issue.

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• ssh-keygen works for root only?

  - by Hulk

  Does ssh-keygen -t rsa work if only set for root user i.e, if the username on local system is sodium and i generate the key using the above said command and on the remote system if i place the key in /root/.ssh authorized_keys ,this works. But on the remote system if the key is placed in /home/natrium/.ssh authorized_keys This still prompts for a password.Is this the expected behavior or is that some thing wrong in the above procedure Thanks..

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• SSH traffic over openvpn connection freezes when I cat a file

  - by user42055

  I have an openvpn (version 2.1_rc15 at both ends) connection setup between two gentoo boxes using shared keys. it works fine for the most part. I use mysql, http, ftp, scp over the vpn with no problems. But when I ssh from the client to the server over the vpn, weird things happen. I can login, i can execute some commands. But if i try to run an ncurses application like top, or i try to cat a file, the connection will stall and I'll have to sever the ssh session. I can, for example, execute "echo blah; echo .; echo blah" and it will output the three lines of text over the ssh session fine. But if i execute "cat /etc/motd" the session will freeze the moment I press enter. I compiled openvpn 2.1.1 on my mac and copied over my config directory from my gentoo client. The mac connected and ssh sessions worked fine without freezing. I then compiled it on my older gentoo box (2.6.26 kernel) which I am retiring due to a dying hard drive, and ssh over it also works perfectly. Why does it fail on my brand new gentoo box ? I've tried compiling three different kernels in case it was that, but other than that there should be no difference between my older and my newer gentoo boxes that I can think of. Any suggestions on what's wrong ?

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• ssh starting a command such as mutt

  - by justintime

  Why does the following not work from one ubuntu machine to anohter ssh user@host mutt (it just sits there doing nothing) Whereas the following is fine ssh user@host ls

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• Linux Teamviewer functionality, but for ssh only

  - by Icapan

  I need to access some Linux server behind NAT (no ports forwarded), so I need to have something like "phone home" like Teamviewer has. There is no GUI, but somebody can log in through SSH and dictate a password if it is changing (like Teamviewer). SSH (port 22) is enough (I can tunnel ports through SSH if I need). Any suggestions? How safe is it?

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• SSH doesn't work in my LAN !!

  - by xrobot

  I am trying to connect to my webserver via ssh but I can't. When I insert the password nothing happens . This is what I see: # ssh [email protected] [email protected]'s password: . I have tryed with a wifi connection of my friend and it does work !! So is it a router problem ? What I have to do ? I ran ssh in debug mode: http://pastebin.com/2sWHMHSW Please help :(

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• SSH Port Forward 22

  - by j1199dm

  I'm trying to set up the following: At work I want to create a local port that will forward to port 22 on my home server. ssh -L 56879:home:22 username@home -p 443 right now I'm testing this on my two machines at home, my ubuntu server and the other my iMac. iMac: 192.168.1.104 ubuntu: 192.168.1.103 iMac - ssh -p 443 -L 56879:192.168.1.103:22 [email protected] in my ~/.ssh/config on my iMac I have port set to 56879. so when I do git pull remoteserver:/path/to/repo.git on my iMac git will use ssh client on my iMac and use port 56879 since setup in config which should forward to 22 on my ubuntu machine. I keep getting connection refused? Any ideas?

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• How does Kerberos work with SSH?

  - by Phil

  Suppose I have four computers, Laptop, Server1, Server2, Kerberos server: I log in using PuTTY or SSH from L to S1, giving my username / password From S1 I then SSH to S2. No password is needed as Kerberos authenticates me Describe all the important SSH and KRB5 protocol exchanges: "L sends username to S1", "K sends ... to S1" etc. (This question is intended to be community-edited; please improve it for the non-expert reader.)

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