SSH (Secure SHell) is a protocol for running commands on a remote computer.

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331 views

“Too many open files ssh” when the number of open files is far below ulimit

I was trying to set up 2000 concurrent ssh connections, but got the error message in server log (i.e. journalctl): sshd[1356]: error: reexec socketpair: Too many open files I've set both the soft ...
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147 views

Flash OpenWrt Routers from Telnet

I have two routers. One has Chaos Calmer and the other has Attitude Adjustment. When I turn them on and check arp, nothing comes up. When I check route, the hardware address says (incomplete) but the ...
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232 views

Error “Can't assign requested address” when ssh-ing to remote server

On ubuntu 14.04 I have installed openssh, changed the ssh port. I can login within LAN with no problems, but I cannot access it from outside. I also have: allowed it though firewall and set up port ...
2
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220 views

Tunnel audio chat over ssh

I'm running a HelpDesk for internal call center employees. Right now, we can chat with employees over our web portal and remote-control their Linux Mint workstations via VNC over a secure SSH tunnel. ...
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109 views

ssh terminating immediately with message Terminated

I have tried following command on my local system (Ubuntu 14.04 LTS): $ ssh localhost The authenticity of host 'localhost (127.0.0.1)' can't be established. ECDSA key fingerprint is ...
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53 views

Run ssh-agent 24/7 using keychain?

I have a Node.js script that requires ssh-agent to be running 24/7 on my Ubuntu server. I installed keychain and put eval 'keychain --eval id_rsa into my ~/.bash_profile, but that only runs when I ssh ...
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3k views

ssh does not get host key

I have a PivosXios-DS-M3 XBMC-Box, wich run xbmc12 until yesterday. All my desktops run Archlinux. Yesterday, I did a fresh install of tofu-linux to the Pivos-box (Kodi 14.1). Thus, on my arch ...
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207 views

Persistent SSH port forward without public keys

Problem I haven't found a solution to run an SSH port forward in a reliable and persistent fashion, when the server you are connecting to does not support public-key authentication. Question What ...
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162 views

How do I test sshguard on debian?

I want to replace fail2ban with sshguard because it uses less resources. I installed sshguard via apt-get and it seems to be running on my debian wheezy server: # /etc/init.d/sshguard status sshguard ...
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181 views

Restrict SSH access to git usage only

Using: ssh-keygen -O force-command="/bin/restricted-command", or command="/bin/restricted-command" at the beginning of an authorized_keys line one can force a key-based SSH connection to execute ...
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39 views

What's the approximate data scale that an ssh session will consume?(without file exchange)

When traveling during holidays, sometimes I need use my mobile as a WiFi hotspot to let my notebook connect to server to do some task. Then a question comes to my mind: How much web data will be ...
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88 views

Avoid creation of .k5login file in a SFTP Chroot configuration

I've successfully set up an sftp with authentication on Active Directory. All users in a particular AD group are managed by SSH's sftp subsystem and chrooted into a common home directory, let's say ...
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79 views

Forwarding C-c to a remote tmux session

I have bind C-c new-window (and other similar bindings, but only C-c is giving me an issue) in my .tmux.conf. On a local tmux session, the binding works as expected, but in a remote tmux session(over ...
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677 views

Increase SSH ConnectTimeout greater than 60 seconds

I don't seem to be able to increase the SSH connection timeout much beyond a minute: $ date; ssh home-qnap -o ConnectTimeout=7200; date Wed 14 Jan 2015 15:23:32 AEDT ssh: connect to host home-qnap ...
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89 views

X forwarding from a mac to Linux fails

I have been having problems recently while trying to ssh into linux servers (Ubuntu 14.04) from my mac (OSX Yosemite 10.10). This used to work fine until my latest update, where I systematically get a ...
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264 views

User Acces restrict to only one folder

I am trying to establsih SFTP User rights at a server to only one folder, following the guidelines here: ...
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800 views

Determine DBUS_SESSION_BUS_ADDRESS from outside the X session

I've got mate-screensaver installed on a machine running Linux Mint 16. On that machine, I can open up a terminal and query the state of the screensaver: dan@box1 ~ $ echo $DISPLAY :0.0 dan@box1 ~ $ ...
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196 views

How to find out what triggers ssh-askpass prompting for passphrase periodically

I recently deleted the contents of my ~/.ssh directory and generated new keys. They new ones work fine, but every once in a while I am getting a gui dialog titled OpenSHH from asking for the ...
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126 views

SSH SOCKS5 proxy, is my traffic being kept safe?

So I've been running everything on my system through my SSH SOCKS5 proxy. All the network commands I type in the terminal, I use proxy chains, and I have my system set to use my SOCKS5 proxy globally ...
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1k views

SSH public key login fails without pattern

I'm running a bunch of servers with Ubuntu 14.04.1 (sun,hyperion,...) all of which use public keys (OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014 on all machines) for rsync without problems. Almost all... ...
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401 views

iptables rule to transfer UDP through a SSH tunnel

The problem I have two programs that runs on two distant computers and communicate through a specific protocol. All I know is that this protocol only communicates through UDP and uses the ports 1101 ...
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597 views

How to pass multiple commands via pssh and multiple xterms

I'm attempting to open multiple xterms and run a command as an SAP user via sudo using pssh. So far, I'm able to run PSSH to a file of servers with no check for keys, open every xterm in the servers ...
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502 views

Cannot connect to ssh server

I am having trouble connecting to my ssh server. It responds with a lengthy error message about no network etc. but it is the last message that concerns me: Sometimes, such troubles can be caused ...
2
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575 views

How does SELinux / SEAndroid prevent or allow pseudo terminal allocation?

I'm trying to resolve an SSH connection issue on an Android phone running SELinux in "Enforcing" mode. The problem is that any SSH connection that tries to allocate a pseudo-terminal (/dev/pts etc) is ...
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87 views

What information is sent from client to the server when a SSH connection is established?

So let's say I'm on machine A and connect to machine B, and then from there I connect to machine C (with three different usernames). So the SSH connections are: A (john) --> B (eli) --> C(bill) ...
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3k views

Unexpected “authenticity of host can't be established.”

Few months ago, I logged to server1 and scp files to server2. Now I want to do the same, but after the scp command I get message: The authenticity of host ... can't be established. RSA key ...
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3k views

Can't Install ImageMagick on Centos using Yum

I am trying to install ImageMagick on my dedicated-virtual Centos server for use with PHP. I first ran the following commands successfully: # yum install gcc php-devel php-pear # yum install ...
2
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35 views

Mount a workstation dir upon login to server over ssh

I'd like to have a local directory be mounted upon logging into a remote server via SSH. So if I were to ssh into foo.bar.com as user baz then there would be a directory mounted in /home/baz/roaming - ...
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302 views

SSH login from external authentication

Here is what I try to accomplish: I have a server with a git repository. I use ISPConfig as control panel for our websites and I want to integrate the ISPConfig API for email authentication as second ...
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448 views

Why is my /etc/hosts.deny file being ignored?

I am using a small embedded linux setup generated by buildroot to run on a x86 device. It was generated to use busybox init system and also runs dropbear so I can ssh into the device. I wanted to ...
2
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1k views

Get screenshots of a Linux machine that I connect to remotely with PuTTY

My setup is this, I connected my Cent box via PuTTY on windows 7, I've Xming and using X11forwarding to have GNOME in windows. Now when I did gnome-screenshot in putty, I cannot have the CentOS ...
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154 views

SSH + Certificate Authority server?

Is it possible to setup SSH (via pam for instance) to check the public key of the connecting client against a CA server? I've tried with gnupg (via gpg-agent --daemon --enable-ssh-support) and also ...
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316 views

Webmin alternative that installs & runs on the client machine & communicate via SSH

Are there any Webmin alternatives that don't consume server resources but instead install on client machine & communicate via SSH client. So effectively all the actions made on that GUI are ...
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419 views

Mint changes default route when eth0 comes back and breaks existing tcp connections

I have two interfaces on my laptop (eth0, wlan0). lets say I am moving away from desk and connecting to an internal network A using openvpn software which uses wlan0 as gateway. I then ssh to a few ...
2
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5k views

ssh-agent not getting set up (SSH_AUTH_SOCK, SSH_AGENT_PID env vars not set)

I set up a new user account for a friend on Kubuntu 12.04. When he uses ssh he gets this error: Could not open a connection to your authentication agent We're running ssh in some bash scripts. ...
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2k views

How to run ssh -t user@remote 'sudo nohup bash -c “comand”' in background

I want to run a script on a remote host with sudo privilege, someone suggests that I should use nohup and ssh -t, like the following command: The script ls; sleep 10; echo finish is crafted here to ...
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92 views

Why isn't hydra being disconnected?

I have SSHD running on port 5800 on some machine. (It is a my machine at home.) If I run this manually in a terminal: # ssh someIP -p 5800 The connection is lost because I am disconnected after 3 ...
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105 views

No communication services enabled following startup

I recently installed Parsix (Debian) on my system, and I've been struggling to figure out how to autostart my services. Of the list of services that don't run and should run are: ssh apache mysql ...
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1k views

How to set ssh access for user on debian?

I set groups: usermod -G ssh username and then I've checked account info: id username the result is: uid=1000(username) gid=1001(username) groups=100(username) Anyway if I try to login using ...
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129 views

Why do I get a different RSA fingerprint when multihopping using ProxyCommand

I'm using the following config to connect to multihop to the target host (gw2 and target have my public key stored in the authorized_keys file ; no netcat on all systems): Host gw1 HostName ...
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10 views

Share socks5 connection to a 2nd NIC system wide

I'm trying to accomplish the following: I have a server with two NICs. One is wireless (wlan0) made as an access point (using hostapd) and the other one (eth0) is connected to a network that doesn't ...
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24 views

I cannnot connect to guest os(protostar) through ssh from host-pc (linux mint)

I'm trying to connect a to guest machine (protostar) through ssh from my host PC (Linux Mint). I'm using VirtualBox. I tried: setting up hostonlyadapters. setting up NAT Networking. ...
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42 views

Vagrant ssh ask for password

I have been following this doc on Vagrant. I installed VirtualBox and Vagrant, then created a folder and ran vagrant init and vagrant up. When I typed vagrant ssh I got this message: The private key ...
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49 views

Slow SSH connection on embedded platform

I am operating an embedded device running the linux core. I have OpenSHH_4.9p1 installed running in debug mode and trying to establish an SSH connection using PuTTY. After the login screen everything ...
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31 views

scp to a KVM guest behind NAT

I have a KVM guest running on a server accessing it via virt-manager. I'm running the guest from my_pc. server has a public IP address and both my_pc and guest can ssh it. guest has a 168.192.x.x IP ...
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32 views

Whitelist Cloud 9 SSH Workspace in AWS

I would like to use Cloud 9 SSH Workspace to SSH into my AWS EC2 instance. I would like to do this for many reasons, one of which is that I am not allowed to install an SSH client on my work computer. ...
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58 views

Freeradius PAM create user and home on login

At this moment i have installed freeradius and PAM radius properly. When i create an account on the system and set a password in /etc/raddb/users.conf the user can login. Sudo also works great with ...
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101 views

Cannot connect via ssh to server with global IP address

I have the no-ip service running on my raspberry pi, it updates the DNS (no-ip) whenever there is a change to it's IP address. I have enabled port forwarding on my router (Asus rt-n66u) ports 22 ...
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84 views

ssh-ing to remote machine connects me back to local machine?

I have two computers: my laptop, vagrant, and my desktop tower, frontier. My username for both is joseph. I can ssh just fine from frontier to vagrant, but I have never been able to do it the other ...
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37 views

Equivalent autossh command?

I am using the following command to setup an SSH tunnel to a remote server. I am using Ubuntu 15.10, and the remote server is running Ubuntu 14.04.3. ssh -N -f -L localhost:7154:localhost:7154 ...