0
votes
1answer
95 views

Intermittent 'ssh_exchange_identification: Connection closed by remote host' error

While there are many questions on this site and others addressing this very issue, I haven't yet found one that seems to address what I'm experiencing. When trying to ssh a linux box from a MBpro ...
0
votes
1answer
483 views

What is the default idle timeout for OpenSSH?

I can't seem to find an answer to this simple question, which I need for some compliance documentation. On a default install of CentOS 6.5 (OpenSSH 5.3p1-94.el6), after how long of being idle will ...
2
votes
1answer
58 views

Only apply Match keyword to single Host in ssh config

I have a host which I ssh into. Sometimes I'm inside the same network, and can ssh directly into it, other times I'm outside it and I need to use a proxy. Because ssh via the proxy server is much ...
2
votes
1answer
180 views

SSH: public key authentication without authorized_keys file

I have a lot of ssh public key logins on a Linux server, e.g.: Jul 25 11:41:01 host sshd[24594]: Accepted publickey for root from xxx.xxx.xx.xx port 33374 ssh2 This is strange for me since there's ...
18
votes
2answers
445 views

What's the purpose of the randomart image for user (not host) SSH keys?

The ssh-keygen generates the following output: The key fingerprint is: dd:e7:25:b3:e2:5b:d9:f0:25:28:9d:50:a2:c9:44:97 user@machine The key's randomart image is: +--[ RSA 2048]----+ | .o o.. ...
4
votes
0answers
615 views

Can't figure out why ssh_exchange_identification: Connection closed by remote host appear

At home, I have setup a Raspberry Pi with the latest version of Raspbian and with ssh enabled. I also use a Mac Book Pro with OS X 10.9.3. I use ssh pi@192.168.0.22 to do some work on the Raspberry ...
2
votes
1answer
81 views

how to connect ssh 'with' specified port?

I know how to connect 'to' a certain port when ssh'ing. ssh user@remotehostip -p XXX but is there a way to establish a ssh 'with' a certain port? I mean, is there a way to specify the port which ...
1
vote
1answer
187 views

Help updating OpenSSH to v6.6

My system is vulnerable to OpenSSH Wildcards on AcceptEnv Vulnerability, CVE-2014-2532. I have tried to update openssh to version 6.6 for centos but I can not get repository[sic] for that version. ...
1
vote
1answer
138 views

Compiling OpenSSH client or Dropbear for Android

I have an interesting problem. I'd like to use a private SSH key with my Android Terminal Emulator (jackpal.androidterm). I'd like to install the private key in a fairly-secure location and be able ...
2
votes
1answer
242 views

Are dropbear and OpenSSH host keys compatible?

The title basically says it all. But mind: host key, not the login key. And if they're not compatible out of the box, is there a way to convert between them - and what would be the steps in that ...
2
votes
1answer
348 views

Generate own (stronger) RSA host key for OpenSSH?

I would like to replace the default 2048 bit host key generated when installing OpenSSH or starting it the first time with one of 4096 bit length. This leads to two questions: Does OpenSSH allow ...
1
vote
2answers
97 views

using ssh-agent

I have my desktop in the office. When X starts, ssh-agent starts automatically. I have to add my SSH key once, at the beginning, and then I can use ssh without having to enter my password each time. ...
6
votes
3answers
426 views

How to prevent “Last Login:” message from showing up when using sftp?

In Ubuntu GNU/Linux 12.04, I have a user johndoe that is part of an sftponly group, set up to sftp to a chroot jail using Subsystem sftp internal-sftp Match Group sftponly ChrootDirectory %h ...
1
vote
0answers
614 views

Force ssh to always use SSH_ASKPASS

I want to force ssh to always use the program specified by SSH_ASKPASS. In my case the program is just a bash script returning the passphrase. The problem is, as the ssh documentation says: If ...
1
vote
0answers
200 views

SSH to Windows 7 with cygwin openSSH freezes when remote conection [closed]

When I SSH into Windows 7(Cygwin) from a remote, the session freezes after few seconds or up to two minutes. This can happen while I'm typing and it can happen when idle. This is still happening after ...
0
votes
1answer
266 views

Understand debug messages from sshd [closed]

I'm using OpenSSH_5.8p1 in my machine,I'm connecting my machine using putty client but its slower so I have ran sshd in debug mode and found following messages can any one explain me in detail about ...
0
votes
0answers
99 views

sshd without pam slower

I am running OpenSSH_6.5 with UsePAM yes in my board. I have observed that with UsePAM no in /etc/ssh/sshd_config, sshd runs slower than previous case. How is this possible? My understanding is ...
1
vote
1answer
229 views

ssh connection fails after login at one user

Have server with 2 users - (e.g. - user and root). SSH login to root works corrctly. But I can't login to user - it immediatelly fails with "write failed - broken pipe" after login. ssh -vvv ...
2
votes
1answer
3k views

Single command to login to SSH and run program?

Is there a way to structure a single command to login via SSH to a remote server and run a program on the remote login shell? In the OpenSSH manual, it reads "If command is specified, it is executed ...
0
votes
1answer
216 views

SSH to Linux Container from Other Machine

I am trying to learn about Linux Containers and this is my first encounter with servers, ssh and many other things that I do not know the terms yet. I create five different containers and authorized ...
-1
votes
1answer
172 views

Double port forwarding - SSH

NOTE: I'm not explaining why I want to do this. But here is the requirement. There are 4 hosts. Host A, Host B, Host C, Host D Host A is running some application which can be accessed at port 8001 ...
4
votes
2answers
112 views

Why are rules not combining in an ssh config file?

It seems like the following would work as expected, i.e., that the second rule, having a hostname that matches the first rule, would apply it. Host *.hostname.com User myuser IdentityFile ...
1
vote
1answer
395 views

Setting the bash SHELL for remote openSSH connections?

I am connected to a Freebsd 10 -STABLE server with SSH from my office box but when I trying to work inside the session I encounter these problems: although I did chsh for every user in said server ...
0
votes
1answer
86 views

Linux Fedora Core 18 freezes on OpenSSH login

miagos:~ $ uname -a Linux miagos 3.9.6-200.fc18.x86_64 #1 SMP Thu Jun 13 18:56:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux I have a reproducible issue, when my desktop Linux node stays online for more ...
4
votes
2answers
146 views

SSH - How to make X applications run on client?

I have the reverse problem that most people seem to be having. If I start an X application while logged into ssh, it displays on the server(host) machine instead of the client(local). This is the ...
0
votes
1answer
50 views

Supply additional ssh options in config file

How can I supply additional options in .ssh/config? I know that information like Host, Port, User etc. may be used in the ssh-configuration file to abbreviate ssh commands. I frequently create ...
0
votes
0answers
876 views

OpenSSH hangs after login without showing login prompt

I ran across an issue with ssh after fresh Ubuntu 13.10 installation on Lenovo T420. I tried git pull (which failed) and this led me to more general ssh failing. After spending some 2-3 hrs of ...
1
vote
1answer
1k views

ssh_exchange_identification: Connection closed by remote host on vnx machine (linux)

I changed the password of my linux machine . I was able to login for sometime and after that I am not able to ssh. I am getting the following error: ssh es4042cs -v OpenSSH_5.1p1, OpenSSL ...
3
votes
1answer
410 views

Disable ForwardX11Timeout without ForwardX11Trusted in OpenSSH Client?

By default, recent versions of OpenSSH automatically set ForwardX11Timeout to 20 minutes if you set ForwardX11Trusted to no. This means that 20 minutes after you start your ssh connection, you can't ...
3
votes
2answers
489 views

SSH access from inside and outside a LAN using the same terminal command

I have a Raspberry Pi (RPi) and I am making remote connections to it using ssh. I have managed to set up ssh correctly such that I can access the RPi both from a local area network and from the ...
2
votes
3answers
1k views

Trying to SSH into my Android phone, but connection closed

I am trying to use the ssh/sftp Daemon app on Android, and SSHing into the phone using an openssh client. Here is the verbose output I get right before the connection breaks debug1: Authentication ...
1
vote
1answer
219 views

Session limit for OpenSSH server on Ubuntu Desktop 7.10

I need restrict session limit on my OpenSSH server only for one session (one connection). I use Ubuntu Desktop 7.10. Of course Version is old, but I need it for experimental purposes. I tried modify ...
1
vote
3answers
167 views

Can't ssh to a machine

All of a sudden, I couldn't ssh to a machine to which I used to ssh earlier. Consider I am ssh-ing from A to B. Output when I run ssh root@ip_addr_of_B I get: Permission denied ...
6
votes
2answers
600 views

Why not simply use %h in OpenSSH ssh's ControlPath option?

Why do the "ssh_config(5)" manpages recommend that the ControlPath option should contain at least the %h, %p and %r placeholders in order to uniquely identify each shared connection? I thought that ...
6
votes
2answers
8k views

What do the channel numbers in ssh error message refer to?

In the example below what do the channel numbers correspond to? Which are on the server? Which are on the client? $ ssh -L1570:127.0.0.1:8899 root@thehost Password: Last login: Fri Aug 9 ...
10
votes
1answer
6k views

Convert OpenSSH private key into SSH2 private key

Is there a way to convert existing pair of OpenSSH keys to the SSH2 (ssh.com format) pair of keys? UPD: since there are some answers about ssh-keygen suddenly appeared, I'll explain where I came ...
3
votes
2answers
366 views

how does ssh discover hostnames on the network?

We have a server on the company network named serverA, and if I type ssh serverA, it will connect my PC to this server, even though there is no entry for this server in my /etc/hosts, but I used to ...
1
vote
2answers
203 views

Unable to force passphraseless ssh authentication while port forwarding

I'm completely at a loss as to what is preventing my local machine from authenticating the connection that is being forwarded from the remote server. I've read a ton of the posts on here regarding ...
3
votes
1answer
78 views

What are all of the SSH Key files?

There are six key files in /etc/ssh directory for private and public keys. 4 of them are for DSA and RSA public & private keys. but there are two more files named ssh_host_key and ...
1
vote
1answer
165 views

How to prevent ssh-agent from starting in CentOS?

How do I stop ssh-agent from starting when logging into CentOS via openssh? There are no references to ssh-agent in my bash startup scripts (.bashrc) or /etc/bashrc.
3
votes
2answers
226 views

Why doesn't the ssh command follow RFC on URI?

The RFC: Uniform Resource Identifier (URI) Scheme for Secure File Transfer Protocol (SFTP) and Secure Shell (SSH) presents the SSH URI as: ssh://[<user>[;fingerprint=<host-key ...
11
votes
2answers
8k views

What difference between openssh key and putty key?

I've found ssh-keygen ("ssh" package) comand produce another keys that puttygen command ("putty" package). If I create public and private keys with ssh-keygen some ssh-servers can not accept my keys. ...
2
votes
1answer
243 views

ssh-add -D doesn't erase stored keys from the ssh-agent

How come this happens?: stan@tcpc:~/.ssh$ ssh-add -l 8192 e0:45:5e:cc:45:3e:17:2b:a6:54:6f:8d:53:1b:j2:e3 github (RSA) 2048 25:41:53:a6:45:5d:ac:eb:5c:45:f8:ce:42:a9:he:aa BITBUCKET (RSA) ...
12
votes
5answers
688 views

what's the purpose of ssh-agent?

I've read the official definition: ssh-agent is a program to hold private keys used for public key authentication (RSA, DSA, ECDSA). The idea is that ssh-agent is started in the beginning of an ...
0
votes
1answer
78 views

ssh private key stops accepting my passphrase

When booting my laptop today I found that ssh (openssh) simply refuses to accept my passphrase when reading my private key. My only idea of how that could've happened is if the HDD has somehow ...
0
votes
1answer
569 views

non root ssh keys help

I'm having issues setting up a different CentOS account with its own pair of SSH keys. I have created the required files but when connecting with Putty it says Connection refused, here's the putty ...
7
votes
3answers
354 views

OpenSSH - map aliases in ~/.ssh/config to IP addresses in command line

Is it possible to query ~/.ssh/config in the command line? Let's say I would like to retrieve what IP address does the particular alias point to in a separate program, is it possible?
2
votes
0answers
297 views

Making ChrootDirectory directory writable by SFTP user

If a user logs into a machine via SFTP, one can make use of ChrootDirectory keyword to give an illusion that user is in a root directory. But that directory is only writable by root user. I would love ...
4
votes
1answer
89 views

how to escape “\”in ssh-copy-id?

I'm connected to Ubuntu server that is a member of a corporate Active Directory domain via likewise-open. The users are in the form mydomain\myuser. I can connect to it via ssh, escaping the \ with ...
21
votes
4answers
20k views

What is the point of sshd “UseDNS” option?

I know what it does, but i don't know why. What attack(s) does it prevent ? Is it relevant for all kind of authentication methods ? (hostbased, password, publickey, keyboard-interactive ...)