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• SSH freeze when UFW is enabled

  - by Cristian Vrabie

  I have a small Ubuntu 10.10 server and i recently noticed a weird behavior (not sure if it was happening before). If I have ufw enabled (with default deny all in, allow all out, allow all http, allow all on a random port i use for ssh) when i perform some actions in a ssh sesion, the ssh console completely freezes. The server continues to work and if i close the console i can start another ssh session. This happens no matter from where I log in (tried from another ubuntu and a mac). The actions are fairly reproducible, for example vim some config files (though vim-ing other files works), cat some other file, etc. The freeze never happens if ufw is disabled. Any idea what's going on? Thanks! Cristian Addition: if you're wondering, yes, I have TcpKeepAlive on yes and I doubt is related (it would happen with ufw disabled too) As requested: my ufw conf below. Also, i don't know if it has something to do but the server has 2 ips. On one is configured the ssh domain, and on one to serve hhtp (via apache2) Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 19922/tcp ALLOW IN Anywhere 9418/tcp ALLOW IN Anywhere 80/tcp ALLOW IN Anywhere 443/tcp ALLOW IN Anywhere

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• No Telnet login prompt when used over SSH tunnel

  - by SCO

  Hi there ! I have a device, let's call it d1, runnning a lightweight Linux. This device is NATed by my internet box/router, hence not reachable from the Internet. That device runs a telnet daemon on it, and only has root as user (no pwd). Its ip address is 192.168.0.126 on the private network. From the private network (let's say 192.168.0.x), I can do: telnet 192.168.0.126 Where 192.168.0.126 is the IP address in the private network. This works correctly. However, to allow administration, I'd need to access that device from outside of that private network. Hence, I created an SSH tunnel like this on d1 : ssh -R 4455:localhost:23 ussh@s1 s1 is a server somewhere in the private network (but this is for testing purposes only, it will endup somewhere in the Internet), running a standard Linux distro and on which I created a user called 'ussh'. s1 IP address is 192.168.0.48. When I 'telnet' with the following, let's say from c1, 192.168.0.19 : telnet -l root s1 4455 I get : Trying 192.168.0.48... Connected to 192.168.0.48. Escape character is '^]'. Connection closed by foreign host . The connection is closed after roughly 30 seconds, and I didn't log. I tried without the -l switch, without any success. I tried to 'telnet' with IP addresses instead of names to avoid reverse DNS issues (although I added to d1 /etc/hosts a line refering to s1 IP/name, just in case), no success. I tried on another port than 4455, no success. I gathered Wireshark logs from s1. I can see : s1 sends SSH data to c1, c1 ACK s1 performs an AAAA DNS request for c1, gets only the Authoritave nameservers. s1 performs an A DNS request, then gets c1's IP address s1 sends a SYN packet to c1, c1 replies with a RST/ACK s1 sends a SYN to c1, C1 RST/ACK (?) After 0.8 seconds, c1 sends a SYN to s1, s1 SYN/ACK and then c1 ACK s1 sends SSH content to d1, d1 sends an ACK back to s1 s1 retries AAAA and A DNS requests After 5 seconds, s1 retries a SYN to c1, once again it is RST/ACKed by c1. This is repeated 3 more times. The last five packets : d1 sends SSH content to s1, s1 sends ACK and FIN/ACK to c1, c1 replies with FIN/ACK, s1 sends ACK to c1. The connection seems to be closed by the telnet daemon after 22 seconds. AFAIK, there is no way to decode the SSH stream, so I'm really stuck here ... Any ideas ? Thank you !

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• SSH broken after homedir permissions and hostname change on EC2-hosted Ubuntu

  - by dimadima

  I changed my instance's hostname using the hostname utility and then set it in /etc/hostname so that the new name survives reboot. My main motivation was for differentiating between instances at the prompt using the \h format in PS1. EDIT I also changed permissions on my home directory. I made my home directory group writeable. Now I can no longer SSH into the machine. The short of it is the error Permission denied (publickey). Running ssh -v, the more verbose output is: debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/dmitry/.ssh/id_rsa debug1: Authentications that can continue: publickey debug1: Trying private key: /Users/dmitry/.ssh/ec2key.pem debug1: read PEM private key done: type RSA debug1: Authentications that can continue: publickey debug1: No more authentication methods to try. Permission denied (publickey). Should I have done something after changing the hostname? Now I can't get into the instance! :(

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• Can't connect to windows via ssh

  - by Micah

  I downloaded cygwin and ran ssh-host-config. I'm trying to connect using ssh -l micah myserver it then says micah@myserver's password: I enter the same password I use to log into windows and it says Permission Denied, please try again. After the third try it says: Permission denied (publickey,password,keyboard-interactive). What am I doing wrong? Any ideas? Do I need to generate an ssh key on the client and add it somewhere on the server?

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• How to run KDM or GDM over ssh

  - by Xolve

  I have a computer on LAN running ssh. I can normally tunnel the GUI application using ssh computer-name -X program-name But I wam my full desktop to be running on a remote computer using ssh so that I can just use that computer remotely like a local desktop. For this I think I will need to run KDM (or GDM ) remotely, what configuration do I need to do to make this happen?

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• Can't port forward ssh on Asus RT-NU56 wireless router

  - by Matt

  I cannot ssh in (using putty) when I use 10.0.1.31 as the address. database server - wired switch part of Asus wireless router - office LAN So basically, we want to ssh in to the database server from our computer on the wired office LAN. Asus router has an ip of 10.0.1.31 and database server has a static IP of 192.168.0.20 I set up port forwarding like this: ssh 22 192.168.0.20 22 BOTH Firewall is turned completely off. Any other settings I'm missing?

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• How to use a private key for authentication with SSH ?

  - by SSH

  Putty has this setting in SSH/Auth, but I don't see where to set it in SSH .

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• ssh during low bandwidth

  - by kfmfe04

  I currently invoke the following ssh command over my home wifi (from OSX to Ubuntu): ssh -XYC -l my_username -c arcfour,blowfish-cbc -XC my_local_server This works great, except during low bandwidth situations, like if I'm streaming music over the Web, while I'm coding. In these situations, the ssh often drops, within a minute or two. Is there a better setting or configuration that I can try over low-bandwidth situations?

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• SSH attack CentOS Amazon EC2

  - by user37143

  Hi, I run a few Rightscale CentOS AMI based instances on Amazon EC2. Two months back I found that our SSHD security is compromised( I had added host.allow and host.deny for ssh). So I created new instances and done an IP based ssh that allows only our IPs through AWS Firewall(ec2-authorize) and chnaged the ssh 22 default port to some other port but two days back I found I was not able to login to the server and when I tried on 22 port the ssh got connected and I found that sshd_conf was changed and when I tried to edit sshd_config I found root had no write permission on the file. So I tried a chmod and it said access denied for 'root' user. This is very strange. I checked secure log and history and found nothing informative. I have PHP, Ruby On Rails, Java, Wordpress apps running on these server. This time I did a chkrootkit scan and found nothing. I renamed the /etc/ssh folder and reinstalled openssh through yum. I had faced this on 3 instances on CentOS(5.2, 5.4) I have instances on Debian as well those working fine. Is this a CentOS/Rightscale issue. Guys, what security measures I should take to prevent this. Please support me this is very critical. Thanks

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• background jobs and ssh connections

  - by petrelharp

  This question has come up quite a lot (really a lot), but I'm finding the answers to be generally incomplete. The general question is "Why does/doesn't my job get killed when I exit/kill ssh?", and here's what I've found. The first question is: How general is the following information? The following seems to be true for modern Debian linux, but I am missing some bits; and what do others need to know? All child processes, backgrounded or not of a shell opened over an ssh connection are killed with SIGHUP when the ssh connection is closed only if the huponexit option is set: run shopt huponexit to see if this is true. If huponexit is true, then you can use nohup or disown to dissociate the process from the shell so it does not get killed when you exit. If huponexit is false, which is the default on at least some linuxes these days, then backgrounded jobs will not be killed on normal logout. But even if huponexit is false, then if the ssh connection gets killed, or drops (different than normal logout), then backgrounded processes will still get killed. This can be avoided by disown or nohup as in (2). There is some distinction between (a) processes whose parent process is the terminal and (b) processes that have stdin, stdout, or stderr connected to the terminal. I don't know what happens to processes that are (a) and not (b), or vice versa. Final question: How can I avoid behavior (3)? In other words, by default in Debian backgrounded processes run along merrily by themselves after logout but not after the ssh connection is killed. I'd like the same thing to happen to processes regardless of whether the connection was closed normally or killed. Or, is this a bad idea?

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• xauth, ssh and missing home directory

  - by flolo

  We have several servers, and normaly everything works fine, except now... we get a new aircondition installed. This takes 36 hours and for this time almost all servers got shutdown, only 2 remaining servers run for the most important tasks (i.e. accepting incoming email, delivering some important websites, login-server). Everybody was informed that when they need appropiate data from the homedirs they should fetch it before take down. Long story short: Someone realized that he have run a certain program on one of the servers. No Problem, he can remote login into our login server and run the programm there without home directory (binaries are local and necessary information can be copied to the /tmp). That works like a charm until... ... the user needs to run a GUI programm. I find no easy way to make it running, usually ssh -Y honk@loginserver is enough but now the homedirectory is missing and ssh is not able to copy the cookies into ~/.Xauthority (as the file server with the home directories is down). Paranoid as all systemadmins all X-Server just listen locally not on tcp ports, so no remote X connection possible SSH config is waterproof - i.e. no way to set environment variables. My Problem is, that the generated proxy MIT cookie from ssh get lost as the .Xauthority doesnt exist. If I could retrieve it somehow I could reenter it a .Xauthority in /tmp. The only other option (besides changing the config) which came to my mind is, makeing a tunnel (netcat, or better ssh) from the remote host to the loginserver and copy the cookie manually (not sure if it the tcp-unix domain socket stuff works as expected). Any good suggestions (for the future - now our servers are already up)?

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• adding remote ssh printer as local printer

  - by guest

  I have SSH access to a remote host (FreeBSD) that has a printer set up. I do not have root access on that host or any other special user rights. Now I want to print directly from my laptop on that printer (Ubuntu 10.10). The problem is that I don't know how to "import" or whatever the the printer, as it needs authetification from my user account (print quota limitations). E-mailing me the files I want to print or scp them every time is a pain, ATM I pipe the PostScript output manually to a ssh command, but that's also a huge working overhead. E.g. when I want to print a foo.pdf pdftops '/path/to/foo.pdf' - | ssh user@remotehost 'lpr -P printername' So, does anyone know of a smooth way to shorten this procedure? Ideally I would just want to use a printername instead of the whole ssh command

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• Reputable web based ssh client?

  - by Doug T.

  I'm sitting at a coffee shop right now, and I suspected I'd be able to ssh somewhere. Unlucky me they seem to be blocking everything but web traffic. I googled "web based ssh clients" however I have reservations about entering my login credentials on any Joe Schmoe's web app. I was wondering if anyone has had any experience with any reputable web based ssh clients? If so could you please point me at one that I could trust?

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• Unable to configure SSH in Cygwin

  - by Sam Vo

  I'm new to Cygwin and I'm trying to install Cygwin with SSH. But currently I got a problem while configuring SSH. I passed all steps for configuring SSH until it asks for the password of the privileged user "cyg_server". I was unable to type any character into the Cygwin for the password. I don't know how to provide the password for this privileged user. Can you please help me on this? Or can you please show me some other way to install the SSH using Cygwin? I appreciate all helps. Regards, Sam Vo

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• Can you specify git-shell in .ssh/authorized_keys to restrict access to only git commands via ssh?

  - by Matt Connolly

  I'd like to be able to use a ssh key for authentication, but still restrict the commands that can be executed over the ssh tunnel. With Subversion, I've achieved this by using a .ssh/authorized_keys file like: command="/usr/local/bin/svnserve -t --tunnel-user matt -r /path/to/repository",no-port-forwarding,no-agent-forwarding,no-X11-forwarding,no-pty ssh-rsa AAAAB3NzaC1yc2EAAAABIetc... I've tried this with "/usr/bin/git-shell" in the command, but I just get the funky old fatal: What do you think I am? A shell? error message.

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• Home computer as ssh bridge

  - by pistacchio

  Hi at work, due to our network configuration, i cannot ssh external servers. We are on a Windows environment. I need to ssh a server of mine, but i can only exit from our LAN via port 88. How could I use my home MacOs box to accept an http connection from my home computer and route it via ssh to the server i need to' connect to? Thanks.

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• EC2 instances keep becoming inaccessible via SSH, can I use elastic loadbalancer to check SSH connectivity?

  - by Rick

  This is mainly an issue for my development ec2 server as it seems that my instance keeps becoming inaccessible via SSH. It happened yesterday so I killed that one and started a new one and happened again later today. The server still works, my web application is accessible in a web browser but whenever I try to connect via SSH I get a pemrission denied (public key) error message in my terminal. I am 100% sure I am doing nothing wrong as I can create a new instance of the exact same AMI (its a personal custom AMI), change absolutely nothing, including using the same .pem key, and then am able to SSH into that new instance using the exact same command as before (just changing the IP address). I understand that ec2 can have issues but having this happen every day seems a bit odd.. I am using an m2.xlarge instance so I don't know if these tend to be unstable, in the past I have used a small instance and had it running for months with no problems which is why I find this so odd. I am looking into using loadbalancing but it seems the only "health" checks they offer is for http or tcp so I'm not sure if I can make it monitor for SSH connectivity. This is important for development as I may make 1-2 new pushes of an application a day and use SSH to do this. I have a designer that needs to have the app always accessible as he works with the front-end files to test output with the live application. Anyways, any advice / info is appreciated

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• How to reliably keep an SSH tunnel open?

  - by Peltier

  I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken. If I could at least monitor the tunnel automatically, I could restart the tunnel when it hangs, but I haven't even figured a way of doing that. Bonus points for the one who can tell me how to prevent my ssh connection from hanging, of course!

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• ssh crashes connecting using host names on windows

  - by AliGibbs

  On a new install of Windows Server 2008, I attempting to use ssh to connect to another host. I have installed putty/openssh. This works without a problem when trying a command such as: ssh 192.168.0.2 However, this will crash when trying something like: ssh testserver with the error as follows in the windows event viewer: Faulting application ssh.exe, version 0.0.0.0, time stamp 0x40843497, faulting module kernel32.dll, version 6.0.6001.18000, time stamp 0x4791a76d, exception code 0xc0000005, fault offset 0x0004bbb8, process id 0xe94, application start time 0x01cb873195e795d5. Any suggestions? thanks in advance

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• ssh tunnel via multiple hops

  - by Mala

  Tunneling data over ssh is pretty straight-forward: ssh -D9999 [email protected] sets up port 9999 on your localhost as a tunnel to foreignhost.com, but I have more specific need: I am working locally on localhost host1 is accessible to localhost host2 only accepts connections from host1 I need to create a tunnel from localhost to host2 Effectively I want to create a "multi-hop" ssh tunnel. How can I do this? Ideally, I'd like to do this without needing to be superuser on any of the machines.

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• Ubuntu SSH issue

  - by palani

  0 Hi, I have the ubntun machine... under my /home/user/.ssh i have my id_rsa.pub key... i carefully copied that key and paste my key to respository Git account. After that i try to connect from locat system to my git respository i got the following error warning: Authentication failed. Disconnected; no more authentication methods available (No further authentication methods available.). . I removed SSH in system and re-enable and did agin.. but no luck.... I have no idea what's happening with my SSH key ....can any one please tell me on this... Note : i noticed in my home /home/user/.ssh && /home/user/.ssh2

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• Ubuntu SSH issue

  - by palani

  Hi, I have the ubntun machine... under my /home/user/.ssh i have my id_rsa.pub key... i carefully copied that key and paste my key to respository Git account. After that i try to connect from locat system to my git respository i got the following error warning: Authentication failed. Disconnected; no more authentication methods available (No further authentication methods available.). . I removed SSH in system and re-enable and did agin.. but no luck.... I have no idea what's happening with my SSH key ....can any one please tell me on this... Note : i noticed in my home /home/user/.ssh && /home/user/.ssh2

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• SSH Access Denied despite correct credentials being used

  - by columbo

  Hello, I have a remote CentOS server to which I had SSH access to. Today when I try to log in via SSH I just get Access Denied even though I am using the correct credentials. I have plesk 9 access and so have reset the admin password and tried to SSH using that password but to no avail. I even created a new user with SSH access rights and tried to log in as them but again failed with the same access denied. I have rebooted. Can anyone offer any advice? There is no file manager in plesk other than for the web domains so I can't get at any system files to see what is going on. Any advice appreciated.

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• Connections to SSH and Samba suffer from heavy delay

  - by Till Helge Helwig

  There are a lot of questions about SSH connections being delayed, which usually can be fixed by disabling the DNS lookups. Unfortunately this doesn't seem to be my problem. Our development server is accessed via SSH and Samba. When opening a connection to the server (either SSH or Samba) it takes a very long time. Accessing a Samba share via Windows is basically impossible because there is a timeout. Using smbclient works, but takes ages. When opening a SSH connection I get immediately prompted for the password and after hitting Enter the terminal instantly shows the MOTD. Afterwards it takes about a minute for the prompt to appear. I watched the load of the server while connecting via SSH and Samba and could not find anything out of order. There is nothing out of the ordinary running and hogging up memory and CPU or something. I have no clue where this delay might come from. I already tried UseDNS no in sshd_config and proxy_dns = no in smb.conf, but to no avail. Any idea about what might cause this would be greatly appreciated!

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• Unable to access the server via SSH

  - by Rishee

  when I am trying to access the server through ssh it says: ssh: connect to host xx.yyy.zzz.x port 22: Connection refused and on the server in auth.log it shows following log entry: Address xx.yyy.zzz.x maps to xx.yyy.zzz.x.static-pune-vsnl.net.in, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT! I have created a user account for that user and it is also in enabled status. Requested info It is Ubuntu 11.10 It is configured as SSH Server using openssh-server I am trying to connect to this server using Putty from Windows 7 i.e. My Desktop I have also asked this on AskUbuntu: http://askubuntu.com/questions/118556/unable-to-access-the-server-via-ssh

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