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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2
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3answers
791 views

SSH Private Key Authentication Failing

I'm kind of stuck here.. I am trying to disable all SSH login capabilities of root. No password login. No key-based login. Nothing. I have a user "andrew" that should only be able to SSH into my ...
7
votes
1answer
2k 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 ...
52
votes
7answers
17k views

Is there a way for one SSH config file to include another one?

In case it matters: OS: Ubuntu 10.04 SSH: OpenSSH_5.3p1 Debian-3ubuntu5 I'd like one SSH config file to include another one. The use case would be to define whatever I want in my default ...
12
votes
6answers
45k views

How to SSH to localhost without password?

EDIT: Putting exactly what was done. I need to SSH to localhost without a password, the usual way of doing it (with public keys) do not work. user@PC:~$ rm -rf .ssh/* user@PC:~$ ssh-keygen -t rsa ...
-1
votes
2answers
645 views

SSH Tunnel doesn't work

I use following command to make a ssh tunnel to my ubuntu server: ssh -fNg -L 8888:127.0.0.1:22 -p 1000 username@server-address -v Then I set OSX http and https proxy to 127.0.0.1:8888 And I got ...
0
votes
1answer
30 views

Doubled terminal emulation sessions renders foreground and background of characters the same color from the destination

I have some no graphics card (“headless”) server that I have to operate via the serial port as the console to install Linux, VMware, and other OSes. For a terminal server I use a Linux box with a USB ...
1
vote
2answers
11k views

Permission denied (publickey,password)

I am trying to connect to local ip via SSH from terminal. Command is ssh -v user@192.168.0.2 But it is not connecting. Keeps giving me the error "Permission denied (publickey,password)." I have ...
0
votes
2answers
179 views

Log Commands Run Over SSH on Client Side

I am looking for a way to run SSH (OpenSSH in particular, but not necessarily) and log all commands that I run against the remote, to a file locally. Running each command as an independent ssh ...
2
votes
1answer
87 views

Something I'm not “getting” about SSH keys: OS portability (Mac to Windows, etc.)

Let's say I create SSH keys in a Mac to connect to my remote server. My server has my public key. My Mac has my private key. So far so good. A few days later, I want to connect to my server by ...
3
votes
1answer
44 views

SSH key exchange configuration uncertainty

I'm currently configuring ssh on a server and reading trough several guides. Many feature a @url.tld after the option in KexAlgorithms like: KexAlgorithms curve25519-sha256@libssh.org This is ...
3
votes
1answer
587 views

How to convert a ppk to an openSSH private key encrypted with a passphrase

When I exported my private key in PuttyGen, I assumed that the passphrase I set was also used on the openSSH version. I'm finding that the passphrase I put in isn't working. What's the right way to ...
1
vote
2answers
106 views

Connecting two separate SSH connections together

I'm working on a small project and looking for some advice on how to make a portion of the project work. Goal - join two separate ssh sessions together. I want to see if keys used to login to bastion ...
1
vote
1answer
230 views

Rsync ask for password even though I can SSH in without a password using a key

This is the command I'm using: sudo rsync -rvz -e 'ssh -p 1111' ******@111.111.111.111:/home/sql/ /media/disk1/bd92a143-c4d7-4b70-bb6a-6576678fa96b/user/Backups/sql/4-6-2015 Any advice?
1
vote
1answer
161 views

How can I SSH from Hong Kong to China?

Me in Hong Kong, girl friend in China. I have installed SSH server on both computers. When both computers were in Hong Kong, I connected both to the internet (via my internet connection at home), ...
74
votes
8answers
167k views

Remove key from known_hosts

I built several virtual machines during the last few weeks. The problem is, the .ssh/known_hosts gives me the Man in the middle warning. This happens because another fingerprint is associated with the ...
6
votes
1answer
2k views

ssh -o PreferredAuthentications: What's the difference between “password” and “keyboard-interactive”?

Both PreferredAuthentications=password and PreferredAuthentications=keyboard-interactive would prompt for the password, so what's the difference between them? I Google'd with the keywords ssh ...
0
votes
1answer
62 views

custom message ssh “ssh_exchange_identification: Connection closed by remote host”

Usually I am blocking hosts with /etc/hosts.deny. When restricted host trying to connect to the sshserver user gets following message "ssh_exchange_identification: Connection closed by remote host" ...
0
votes
0answers
68 views

Usage of ssh-agent with signed SSH keys

My ssh-agent doesn't want to store my credentials for Signed SSH key when connecting to a SSH server that use a SSH CA. I mean, each time i try to logon it ask me for the passphrase of the certified ...
0
votes
1answer
100 views

ssh session timeout using openssh client

I have a system which I can reach via ssh. I can reach it from a windows PC using putty and from a ubuntu system (Ubuntu 14.04.2 LTS). When I connect with putty to the system and doing the following ...
6
votes
3answers
6k views

Configure OSX Firewall to Allow SSH Server?

If I turn on my OSX firewall, ssh is disallowed. If I turn it off, ssh can connect just fine. These are the settings from the ssh host: while I don't know what I'm doing, I figured that giving ...
0
votes
2answers
181 views

Can't install openssh under ubuntu 14.04

I am just trying to install openssh-client and openssh-server on my Ubuntu 14.04 machine. When I do sudo apt-get install openssh-client I get the following: http://pastebin.com/YJp04iin (I ...
9
votes
2answers
11k views

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 ...
0
votes
2answers
185 views

SSH Server Not Visible to the Public Internet

I have OpenSSH Server installed on a Ubuntu (Server) 14.04 machine. I can connect over my local network but cannot across the Internet. I have port forwarding set up on the router. I have tried: ...
1
vote
1answer
282 views

Can't connect with OpenSSH sftp with custom port

I am using Cygwin on Windows 7. I have installed OpenSSH client and i am using it connect to Ubuntu server installed on virtualbox through localhost. I am connecting through ssh with this command: ...
0
votes
2answers
605 views

SSH config host match port

I have a server that has multiple "SSH daemons" running (actually Stash and OpenSSH), with different SSH keys needed for each. These daemons are listening on 2 different ports. In the SSH config on ...
1
vote
3answers
189 views

Using OpenSSH on Windows for enterprise use

Is OpenSSH for Windows (using Cygwin) is considered to be robust & stable for enterprise use?
2
votes
0answers
368 views

OpenSSH without password does not work Cygwin Windows 7

I've tried several ways to install openssh without password but it does not work. With password it works fine! (Cygwin, Windows7 32Bit) First I did it like execute ssh command without password? ...
8
votes
1answer
8k views

How can I find a list of MACs, Ciphers, and KexAlgorithms that my openssh client supports?

Is there a way to make ssh output what MACs, Ciphers, and KexAlgorithms that it supports? I'd like to find out dynamically instead of having to look at the source.
0
votes
1answer
122 views

Disabling ECDSA

Guys I've just installed ArchLinux on my Cubieboard, but I can't connect via ssh to the target. Problem is in encryption. Putty and a SSH client on my Android device doesn't support the algorithm. So ...
0
votes
1answer
145 views

How can I force SSH to ignore the IdentityFile listed in “Host *” for one specific host?

My SSH config file is set up to use a specific IdentityFile in the Host * section as the default key. For one particular host, I want to offer a different key (and only that key, never the default ...
1
vote
1answer
230 views

Password less ssh AIX Linux

I tried to configure password less SSH from AIX to Linux. I executed the command. scp .ssh/id_rsa.pub root@10.170.163.74:/root/.ssh/authorized_keys When I execute the command and try to connect ...
1
vote
1answer
424 views

SSH jump hosts error

I have trouble understanding a peculiar behavior of ssh jump hosts. I have these configurations in my ~/.ssh/config: Host bastion-server Hostname server.bastion.com ForwardAgent yes User user ...
0
votes
1answer
102 views

an ssh subsystem that does ls

Normally you create a subsystem by doing Subsystem vim /usr/bin/vim or something like that. So how would I do a subsystem that did ls -la? ie. you call the ls subsystem, it gives you an ls and then ...
4
votes
4answers
9k views

Cygwin sshd did not start due to a logon failure

After a cygwin sshd install, sshd service fails with: Error 1069: The service did not start due to a logon failure I try to give cyg_server standard user and admin access. The error is the same ...
0
votes
1answer
81 views

Interactive program ignores keystrokes on a CygWin OpenSSH Server

I am running Windows 7 SP1. I have installed CygWin with OpenSSH, so now I have a running SSH Daemon that seems to be working OK, except for a problem with an interactive command-line program that ...
2
votes
0answers
144 views

SSH Agent Forwarding not working even when using `ssh -A`

First of all, I've checked all the following Agent Forwarding not working Extra configuration required for ssh-agent forwarding? SSH Agent Forwarding Not Working ...
2
votes
2answers
669 views

How to use ssh-agent.exe without cygwin for pass-phrase protected private key?

I would like to access a SSH service with pass-phrase protected private key in Windows using ssh-agent.exe. So far I able to utilize ssh-agent.exe by changing environment setting in my home account ...
0
votes
1answer
398 views

openssh server not able to root login

I have root filesystem(compiled using Buildroot). I start openssh server by executing /usr/sbin/sshd. /usr/sbin/sshd uses /etc/sshd_config to configure itself . The parameters enabled in ...
0
votes
1answer
55 views

unable to use ssh-1 despite protocol being 2,1 in sshd_config file

When I do telnet localhost 22 I get SSH-2.0-OpenSSH_6.6p1 Ubuntu-2ubuntu1 back. Since my sshd_config file has Protocol 2,1 in it (vs Protocol 2) shouldn't I be getting SSH-1.99-OpenSSH-6.6p1 ...
2
votes
1answer
56 views

OpenSSH server refuses to accept key authentication unless logged into server locally

My server is running Ubuntu-Server and ahs OpenSSH-Server installed on it. I set up the /etc/ssh/sshd_config file to accept and require rsa keys, it looks for keys in the 'AuthorizedKeys ...
0
votes
0answers
178 views

SSH key verification fails when connecting for first time

I'm trying to connect and it fails to verify key. I have no problems when connecting by PuTTY. $ ssh -v xxx.xxx.xxx.xxx OpenSSH_6.0p1 Debian-4+deb7u2, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading ...
0
votes
1answer
241 views

Accessing mysql behind firewall with ssh port forwarding

I have an architecture which looks like this: | - DMZ - | ________ | ________ | _______ | CLIENT | | | SERVER | | | MYSQL | |________| | |________| | |_______| ...
0
votes
2answers
62 views

ssh keeps asking for new password

I want to login to a Linux box with openssh installed. After each login ssh requests me to change my password because it is outdated. How can I prefent this? The server system is created with ...
0
votes
0answers
426 views

Unable to SSH into freshly installed debian VM, “Permission denied, please try again.” error

I just set up a Debian 7 VM. I can ping my VM from host OS, which is Ubuntu 14.1, but can not ssh into VM. Here is the output of ssh -v EDIT: I am using virtulbox. I am not using any command line ...
3
votes
1answer
2k views

Can't write or download to SFTP on Ubuntu Server 10.04

I'm having a problem setting up SFTP with an Ubuntu Server 10.04 LTS x64. I use openSSH with public key authentication, I can login with SSH perfectly with the keys no problem. I can also connect to ...
0
votes
0answers
419 views

Ubuntu 14.04 ssh server hanging when connecting but pings works

I am running an Ubuntu ssh server with login and ChallengeResponseAuthentication enabled. However, the following command outputs this and hangs until timing out: ssh -vvv name@xxx.xx.xxx.xxx ...
0
votes
0answers
72 views

ssh-agent/ssh-add - how can I force confirmation by default?

I use ssh forwarding alot and I'm concerned about "agent hijacking", so, I like to use -c option when calling ssh-add, which enforces confirmation on every key usage. How can I turn the confirmations ...
0
votes
1answer
1k views

SSH authorized_keys and newline

I am trying to configure SSH with public-key authentication on Debian. I can't seem to get it to work because auth.log keeps saying that can't read key type:...(key line)\n. It keeps complaining ...
2
votes
0answers
769 views

Launchd not launching ssh-agent after plist edit

I'm trying to reconfigure my ssh-agent to have a timeout via the -t argument. I edited /System/Library/LaunchAgents/org.openbsd.ssh-agent.plist <array> ...
6
votes
1answer
772 views

How are Ciphers, MACs and Key exchange algorithms negotiated by OpenSSH?

Looking at the man page for sshd_config I see the default list of algorithms for Ciphers, Key Exchange (KEX) and MACs. In my set up, I have selected a subset of these algorithms for use (i.e. I don't ...