OpenSSH is one of the most popular implementations of SSH used today and available by default in many Linux and Unix-like operating systems.

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Howto force ssh to use a specific private key?

With ssh -i <private key filename> you can instruct ssh to use an extra private key to try authentication. The documentation is not clear on how to explicitly use only that key.
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What is the public key file that is generated by PuTTY?

If I'm using the PuTTY key generator to create a public/private key pair, there is a button to "Save public key" like so: However OpenSSH doesn't accept the format of this public key file, at least ...
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716 views

SSHD Consuming 100% of CPU (Hundreds of processes) - Will not die

Recently I've noticed that SSHd on a few systems I administrate will start spawning unstoppable processes which will consume huge amounts of CPU. The syscall shows that the processes are all ...
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102 views

ssh_exchange_identification after few attempts

To help find diagnose a ssh issue with a gitlab server, I've written the following script #!/bin/bash while : ; do ssh -v git@example.com || exit 1 done After few successful iterations ...
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213 views

how to speedup ssh-keygen

We are using beaglebone based custom board. In one of the init script we are generating ssh keys but it takes around 7 seconds to generate the ssh-keys. How do we speedup the process of generating ...
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226 views

Android SHH tunneling through school Wi-Fi

Ok so I'll try my best to explain the situation at hand here. My school recently got a new web filter that blocks literally, everything. I can't use Google Drive or anything that I need anymore. Our ...
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329 views

XCOFF32 object files are not allowed in 64-bit mode while installing Crypt-SSLeay-0.65_02

I am installing a Perl package Crypt-SSLeay-0.65_02 in an AIX 6.1 system but while performing perl Makefile.PL getting the following error. The test suite can attempt to connect to public servers to ...
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1answer
162 views

Prevent multiple ssh-tunnel to same port and ip

Im creating a few ssh-tunnel connections to a remote system with this command: ssh -R port:localhost:2222 user@ip If this command is now execute multiple times, it will create every time a new ...
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221 views

GIT via OpenSSH in Powershell is fine, so why can't I connect in plain cmd console?

when I run ssh user@servername01 ...under powershell it connects without a problem, however when I run the same command under a standard cmd prompt I am prompted for a password (no password is set ...
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1answer
4k views

How do I specify the key exchange method in OpenSSH?

I'm trying to understand how OpenSSH decides what key exchange method to use. What I don't see is how to specify the method. In addition, I know every ssh server/client is required to support at least ...
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170 views

Forcing ssh connection to use rsa key authentication (no root)

Is there anyway as a standard user to be able to force all login attempts to my account to use rsaauthentication? I have a school linux login but obviously I don't have root access or sudo access, is ...
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263 views

Mass creating users who can login via ssh keys but not with a password

I am trying to mass creating users that can login via ssh private/public keys but which can not login with users (kind of like using newusers but I want to make sure users will not be able to login ...
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352 views

What ProxyCommand to use for ssh host-based authentication relay?

I have a host $HOST which I can (only) access by sshing to a host $BASTION and then, by host-based authentication, connect to with ssh $HOST. $HOST does not accept access by for example public-key ...
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53 views

SSH communication to go through Tor

I've been trying this more specifically the SSH: Method 3 (socat). At the end of the method it says: If you want every SSH communication to go through Tor, you can even say : Host * ProxyCommand ...
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3answers
155 views

Chroot sftp jail seems to be insistent on not working

So I followed this guide to the letter: http://markshust.com/2013/04/01/how-setup-chrootd-sftp-account-linux and a few other guides as well, but I seem to be incapable of getting a connection. I am ...
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59 views

OpenSSH client refuses to use a new key file

After generating a new ssh private key (id_rsa) on one server and distributing it across a server network, one server is failing to use the new key, and falls back to password authentication instead. ...
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no version information available (required by /usr/bin/ssh)

I am getting no version information available when making ssh. Openssl verion: sat:~# openssl version OpenSSL 1.0.1f 6 Jan 2014 Here is output of ldd /usr/bin/ssh: /usr/bin/ssh: ...
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59 views

What is the keyword in .ssh/config for tunneling in the background?

In command line option, we can specify -N -f to let it run in the background. How about the identical keywords in .ssh/config? Instead of doing ssh dest -N -f -L 1337:localhost:1337 I would like to ...
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555 views

Use a server as a remote SOCKS proxy using OpenSSH

I want to use a server I have as a SOCKS proxy for browsing from my laptop. According to OpenSSH's man page, you can do that with the opcion -D -D port Specifies a local ``dynamic'' ...
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4answers
984 views

Remote SSH to VirtualBox instance

I have an Ubuntu 13.10 instance running on a remote VirtualBox that I need to maintain for someone. I'm trying to figure out how I can SSH into this instance. Ubuntu has OpenSSH installed, but so far ...
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122 views

Bash command substitution and variable issue

I am writing some simple backup utility in bash and any output must be in JSON. I am checking for host reachability and if any error occurs, I want to print it out. However, I have an issue with ...
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303 views

Can not connect via sshd on scientific linux 6

I try to connect over ssh to my working machine (in the same network). The machine is reachable by ping and responds with the password prompt when I try to ssh it. But doesn't accept the password. I ...
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61 views

Why my reverse ssh is closing when I try to connect to it?

I'm using a reverse SSH tunnel on Debian with openssh-server and autossh: something like -R 1234:localhost:22 with a monitoring port also set. Generally, it works well, but I'm having the following ...
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308 views

Can I use a password ssh login on a passwordless windows 8.1 account? (Cygwin)

I recently installed Cygwin + OpenSSH (package) on Windows 8.1. However, I'm only using one passwordless Windows account on that machine, but I would like to login with SSH remotely with password (for ...
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210 views

After I switch default SSH ports, why does NMAP display port service as “down”

Running Ubuntu 13.04, I edit sshd_config to change Port 22 to Port 2022 When I reload my sshd service and nmap the server from my local machine, I get this: PORT STATE SERVICE 2022/tcp open ...
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OpenSSH ~/.ssh/config host-specific overrides not working

I've tried setting up my ~/.ssh/config file with the help of this guide. However, the host-specific User override has no effect and ssh tries to connect using the global username instead of the ...
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101 views

OpenSSH, FreeBSD screen overwrite when closing application

I installed a fresh FreeBSD 10 on a VM and connected via SSH and I've noticed that whenever i close a program (e.g., htop, top, nano etc) the contents of the session gets overwritten. This doesn't ...
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2k views

Forwarded connection refused by server: Administratively prohibited [open failed]

I sometimes use PuTTY as a SOCKS proxy, and I've noticed that sometimes, when the web-page I'm trying to connect to (from the web-browser) does not exist, and requires a prolonged timeout, the shell ...
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git pull does nothing / git push just hangs / debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

I had an issue in ubuntu 13.10 and 12.10 where attempting to connect to github (git clone / pull / push or anything) would fail with no output. I checked my /.ssh directory for config and any ssh ...
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397 views

OpenSSH on a Windows box using domain authentication: can't logon

On my windows 2008 box I just did what the steps said: mkgroup -d >> ..\etc\group mkpasswd -d -u username >> ..\etc\passwd In my passwd file, I see my user like it's been pulled in from the ...
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39 views

passwordless ssh-keygen not working [duplicate]

I've seen many pages on ssh problems similar to this but so far none of them answer my question. I've been trying to set up passwordless ssh for a while now with little success, I'm creating a blank ...
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84 views

Configuring SSH server to require RSA key

I'm trying to configure my SSH server to require users to have an RSA key. To do this I have the settings in sshd_config set to RSAAuthentication yes PubkeyAuthentication yes #AuthorizedKeysFile ...
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1answer
2k views

ssh <username>@<host> How do I find the user name and host name of my local machine?

I just installed openssh on my Xubuntu machine using this guide. It's installed successfully which I checked by doing ssh -v localhost. Now I want to ssh into this machine from my mac. I have my ...
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How can I get the root account to generate an acceptable ssh key?

On an ubuntu machine I did the following: ~$ sudo su - [sudo] password for jamie: root@mydomain:~# ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key ...
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281 views

ssh config Host wildcards and fully-qualified names

I have a ~/.ssh/config file that looks like this: Host server* HostName %h.farm.example.com When I ssh server01, it connects to server01.farm.example.com correctly. But when I ssh ...
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2k views

Win7 OpenSSH config: no address associated with name

I am using OpenSSH on win7. My home dir is C:\Users\JG, and inside that dir I have the file C:\Users\JG\.ssh\config, with these contents: Host <redacted server ip here> HostName ...
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ssh localhost password-less Login not working

I have been trying to ssh localhost into the same machine. I copied the generated public key into the authorized_keys file. It still doesn't work. I have spent hours on trying to find a solution to ...
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How do I enable auto-logout of Interactive ssh logins after one hour

I have requirement where I want my ssh seesion to target will logout after one hour,but currently leaving an ssh session to target board idle does not get auto logout after one hour. Below is what is ...
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84 views

direct ssh connection when default proxy is configured in ~/.ssh/config

Here's my ssh config: Host *.* ProxyCommand /usr/bin/connect-proxy -S proxy.home.net:1080 %h %p It sets a default proxy for domains containing dots. I want to change it to connect directly ...
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2answers
2k views

SSH Constantly Hangs at SSH2_MSG_SERVICE_ACCEPT Received

I'm having problems with SSH. I can't connect to anything; every connection hangs indefinitely at SSH2_MSG_SERVICE_ACCEPT RECEIVED. I'm on OSX 10.6.8. I'm thinking that it's a problem with my SSH ...
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432 views

Directive 'ChrootDirectory' is not allowed with new OpenSSH

I am trying to set up chrooted SFTP access but OpenSSH is giving this error: /etc/ssh/sshd_config: line 94: Bad configuration option: ChrootDirectory /etc/ssh/sshd_config line 94: Directive ...
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456 views

generating keys for SSH

From the Open-SSH Documentation what does username@remotehost mean in the following: *By default the public key is saved in the file ~/.ssh/id_dsa.pub, while ~/.ssh/id_dsa is the private key. Now ...
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Reducing OpenSSH session key size

I am running into severe performance issues using SSH/Rsync on a Synology NAS (model DS413j if anybody knows anything about it). Both the sshd and the rsync processes are taking 100% CPU on the NAS, ...
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431 views

How can I add a ssh host key in a client programmatically?

After installing a server, I want it to connect to a remote host and add its host key to ssh without asking for confirmation, inside a script. Can I do so by passing the expected fingerprint to the ...
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102 views

SSH certifificate authentication via .ssh/config

I can login to my server using a certificate if I issue the command directly in the shell: $ ssh -p 26000 rambo@jumanji.gov However, when I configure this host in .ssh/config falls back to password ...
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Why is SSH so slow over UMTS while SCP has acceptable speeds

I'm using ssh to access a laptop (running that connects to the internet through UMTS. It is painstakingly slow to type any command. However when I use SCP to copy a file from the same laptop to the ...
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257 views

OpenSSH vs PuTTY… - native support for proxy?

I am wonder a bit. I use openssh-clients-6.2p2-4.fc19.x86_64 on my Fedora 19. I set the environment variable through the console: "export http_proxy=http://someproxy.officenetwork" and in the same ...
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Why is it possible to continue working in a ssh session after a network disruption?

What enables the Secure Shell client and server to resume communication after one or several network interfaces in the communication path between them is shut down and re-appears some moments later? ...
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Does OpenSSH really replaces the programs that it says it does?

In www.openssh.org I read the following lines: The OpenSSH suite replaces rlogin and telnet with the ssh program, rcp with scp, and ftp with sftp. Also included is sshd (the server side of the ...
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2k views

Can I access a remote web server over an SSH connection?

I recently set up a remote server, which I have running the bare minimums currently. I set up OpenSSH and can access the machine through one of my domain names (using an A-type DNS record). I also ...