Questions tagged [ssh]

Secure Shell (SSH) is a protocol primarily for encrypted shell connections. This tag is also used for questions about sshd and openssh, the two standard applications for using SSH.

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Connect to remote MySQL using proxy

I'm trying to connect to a remote MySQL server (with TCP access limited to a specific IP) using port forwarding via SSH, but still haven't figured out how to do it. Here's what I intend to do: Local[...
hypeflow's user avatar
6 votes
4 answers
2k views

Giving SSH access to a user, and security issues

Okay, so I have a VPS and I made an account for a friend so he can host his own domains (using the reseller features in DirectAdmin). He's asking for SSH access, and I know that this is probably a bad ...
Kris Sauquillo's user avatar
17 votes
3 answers
23k views

Rsync over ssh with root access on both sides

I have one older ubuntu server, and one newer debian server and I am migrating data from the old one to the new one. I want to use rsync to transfer data across to make final migration easier and ...
Tim Abell's user avatar
  • 1,391
0 votes
2 answers
910 views

SSH into remote server using Public-private keys

I have recently setup ssh on two linux machines (lets call them server-a, client-b). I have generated two ssh auth files on client-b machine using ssh key gen and can see both public and private files ...
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2 votes
2 answers
1k views

Can I port forward to an established reverse ssh tunnel

I have three computers, A, B and C. A has initiated a reverse ssh tunnel to B. ssh -nTNx -p 443 -R 22222:localhost:22 [user]@[server] If I log in to B, I can use 'ssh -p 22222 localhost' and I get ...
user avatar
1 vote
3 answers
1k views

Remove identifying information from SSH

When I do an nmap -sV 127.0.0.1 -p 22 of my system I get the following information: SF-Port22-TCP:V=4.62%I=7%D=11/9%Time=4916402C%P=i686-pc-linux-gnu%r(NULL,2 SF:7,"SSH-2.0-OpenSSH_5.1p1\x20Debian-...
Rook's user avatar
  • 2,695
1 vote
2 answers
753 views

Forwarding ports with ssh on Linux

I have a database server, let's call it: dbserver I have a web server with access to my dbserver, let's call it: webserver I have a development machine that I'd like to use to access a database on ...
Patrick Klingemann's user avatar
1 vote
1 answer
4k views

Can I use the same machine as a client and server for SSH?

For development tests, I need to setup an SFTP server. So I want to know if it's possible to use the same machine as the client and the server. I tried and I keep getting this error: > Permission ...
achraf's user avatar
  • 101
2 votes
2 answers
2k views

ssh -x : howto get clipboard?

I'm connected to a server via ssh -x and my only way to get text out of the system is the x clipboard (unless i want to take thousends of screenshots and OCR over it). I can not execute any programs ...
user avatar
84 votes
8 answers
155k views

Is it possible to use rsync over sftp (without an ssh shell)?

Rsync over ssh, works great every time. However, trying to rsync to a host which allows only sftp logins, but not ssh logins, provides the following error: rsync -av /source ssh user@remotehost:/...
Tom Feiner's user avatar
1 vote
2 answers
5k views

sftp chroot access via SSH

I have this setup in sshd_config: AllowUsers test1 test2 Match group sftpgroup ChrootDirectory /var/www X11Forwarding no AllowTcpForwarding no ForceCommand ...
Cudos's user avatar
  • 539
0 votes
1 answer
612 views

X11Forwarding on MacOSX (Leopard/Snow Leopard)

I have some remote boxes, which are a bunch of Mac Mini's. I access them now through SSH, and it fits my needs to do the maintenance. In the past, I used X11Forwarding with Linux boxes, when I was ...
Shyam's user avatar
  • 264
9 votes
4 answers
57k views

How do I restart ssh or sshd on Ubuntu?

I want to restart ssh or sshd but I get this error: qqqq@Matrix-Server:/$ sudo /etc/init.d/ssh stop sudo: /etc/init.d/ssh: command not found qqqq@Matrix-Server:/$ Do I need to install ssh or sshd or ...
user avatar
2 votes
1 answer
597 views

Forward one RDP port on one machine to multiple external users at the same time

We have a windows server 2003 machine with rdp service listening on the standard port 3389. For security reasons this port is not opened on the router, but we have freesshd service running and a ...
user12096's user avatar
  • 937
1 vote
3 answers
10k views

can you run a shell command via nohup at later time?

I'd like to run a script at 6pm on a remote server but don't want to wait around to trigger it. I don't want to use cron since it's a one time deal. Can I do something like "nohup myscript &" ...
user41172's user avatar
  • 165
2 votes
3 answers
2k views

How to run a script in Ubuntu via SSH as superuser?

So I have a script that needs to be executed remotely as root. This isn't a problem with most Linux distros since they have a root account. But since Ubuntu does not, executing anything as root ...
Irinotecan's user avatar
6 votes
4 answers
8k views

ssh port forwarding freezes after 10 simultaneous connections

I am using port forwarding to utilize proxy server which is on remote machine. Remote machine hostname is remotemachine. Proxy is listening on 8118 port. I am translating this port to local port 5223....
Marko Kevac's user avatar
5 votes
2 answers
11k views

Linux Teamviewer functionality, but for ssh only

I need to access some Linux server behind NAT (no ports forwarded), so I need to have something like "phone home" like Teamviewer has. There is no GUI, but somebody can log in through SSH and dictate ...
Icapan's user avatar
  • 484
1 vote
2 answers
744 views

Glassfish installation error: cannot open display

When trying to extract the Glassfish jar file with java -Xmx256m -jar glassfish-installer-v2.1-b60e-linux.jar i get following error: (.:31766): Gtk-WARNING **: cannot open display: and extraction ...
whlk's user avatar
  • 125
2 votes
4 answers
37k views

howto copy files on esxi datastore using scp?

how to copy files on esxi4 datastore (fs=vmfs) over network using console (SSH)? giving up older question:have seen on vmware forums that its not possible have a USB drive NTFS attached to ESXi4 host....
JMS77's user avatar
  • 1,275
4 votes
2 answers
7k views

Cygwin, ssh, and git on Windows Server 2008

I'm trying to setup a git repository on an existing Windows 2008 (R2) server. I have successfully installed Cygwin & added git and ssh to the packages, and everything works perfectly (thanks to ...
Paul's user avatar
  • 998
5 votes
2 answers
10k views

How to prevent ssh git push to set file ownership?

I have a remote bare Git repository on an Ubuntu server, where the files are owned by the user my_project and the group my_project, with permissions set accordingly. All commiters are themself in the ...
Bite code's user avatar
  • 399
4 votes
2 answers
4k views

duplicity fail: not promping for password: "Running 'sftp user@host' failed"

I have two linode VPS accounts and I want to back up one onto the other (the reasons are mainly for fun and to practice server administration.) the short version Duplicity isn't even asking for my ...
Alexander Bird's user avatar
2 votes
3 answers
4k views

Disabling all commands over SSH

Suppose use can ssh to the server and can execure FTP and connect to other sources, download a virus and execute it. Is it possible to force user to execute only some known commands?
user24912's user avatar
  • 247
1 vote
2 answers
253 views

Can it be harmful to have execution permission for home directory

I want to know the risks and dangers of this situation where a hacker have access to my SSH server with a user account that has only access to home directory and can read,write and execute commands. ...
user24912's user avatar
  • 247
2 votes
4 answers
229 views

let ssh account only access specific directories

If you have an ssh account and a hacker can get his hands on your account then the hacker can almost do anything on your server. Is it possible to limit a ssh account to access only on some specific ...
Ehsan Baghaki's user avatar
343 votes
27 answers
560k views

Can I automatically add a new host to known_hosts?

Here's my situation: I'm setting up a test harness that will, from a central client, launch a number of virtual machine instances and then execute commands on them via ssh. The virtual machines will ...
gareth_bowles's user avatar
2 votes
6 answers
852 views

When connecting to a unix box, how does it know you have SSH setup on your desktop?

When you use something like putty to connect to a linux box, and you setup your SSH keys etc. When connecting, how does it tell the server that you want to connect using your SSH keys? Is SSH ...
Blankman's user avatar
  • 2,901
1 vote
3 answers
2k views

probems using ssh from cron

I am attempting to automate a script that executes commands on remote machines via ssh. I have public key authentication setup between the machines using ssh-agent. The script runs fine when executed ...
user avatar
2 votes
1 answer
135 views

SSH authentication working unless ran from script?

I have set up my server to allow key/pair authentication by following instructions similar to what is found in this post. As far as I can tell that is working correctly. If I do the following, for ...
A.C. Wright's user avatar
21 votes
3 answers
48k views

Connect through SSH and type in password automatically, without using a public key

A server allows SSH connections, but not using public key authentication. It's not within my power to change this at the moment (due to technical difficulties, not organizational) but I will get on it ...
Deleted's user avatar
  • 1,832
1 vote
2 answers
326 views

Postgresql Data Aggregation over WAN Securely

Need some advice on how to proceed with this situation: My current scenario is that I have several postgresql (50+) boxes deployed throughout various locations and data centers and a beefy postgresql ...
user avatar
2 votes
1 answer
10k views

CopSSH SFTP -- limit users access to their home directory only

Let me preface this by saying I've read and followed these instructions at the FAQ many times: http://www.itefix.no/i2/node/37 It does not do what the title claims... It allows every user access to ...
user avatar
8 votes
3 answers
5k views

Configure SSH to allow port forwarding but no commands for particular key?

So I've added a public key to authorized_keys. How can I limit it so that it may forward ports but it may not have a shell?
thelsdj's user avatar
  • 840
12 votes
5 answers
732 views

How public should a public key be allowed to become?

I have a script that I use to setup new slices on slicehost and one of the steps is to add my public key to the authorized_keys file. At the moment I scp a key manually, but ideally I would have the ...
Peter Coulton's user avatar
0 votes
2 answers
1k views

pecl-ssh2-0.11 Freebsd Compile error after upgrading to php 5.3.2

Hi I've been looking for answers for this all day and can find nothing to solve my issue. I also came across a question about this port on serverfault that I just answered and will hopefully help ...
Alistair Prestidge's user avatar
3 votes
2 answers
2k views

Exposing a WebServer behind a firewall without Port Forwarding

We are deploying web applications in java using tomcat on client machines across the country. Once they are installed, we want to allow a remote access to these web applications through a central ...
pbreault's user avatar
  • 131
3 votes
1 answer
2k views

ssh authentication nfs

I would like to do ssh from machine "ub0" to another machine "ub1" without using passwords. I setup using nfs on "ub0" but still I am asked to insert a password. Here is my scenario: machine ub0 ...
user avatar
1 vote
0 answers
415 views

ssh through a bastion machine works on someone else's desktop but not my own

I have to ssh into a bastion (jump) server in order to get to the final server. On the jump server, my .ssh/config says: Host * ForwardAgent yes My co-worker uses PuTTy and Pageant. When I use a ...
Terrence Brannon's user avatar
6 votes
6 answers
20k views

(svn+ssh) getting bash to load my PATH over SSH

This problem comes up with me trying to make svnserve (Subversion server) available on a server through SSH. I compiled SVN and installed it in $HOME/bin. Local access to it (not through SSH) works ...
Eli Bendersky's user avatar
220 votes
9 answers
1.0m views

How to check sshd log?

I have Ubuntu 9.10 installed with sshd and I can successfully connect to it using login and password. I have configured an RSA key login and now have "Server refused our key" as expected. Ok, now I ...
grigoryvp's user avatar
  • 3,795
15 votes
6 answers
23k views

How can I automatically change terminal colors when I ssh a server?

I'm frequently logging into different servers from my os x terminal window. I'd like to assign a color scheme for different hosts so that my terminal windows are easier to tell apart. Can this be ...
user avatar
213 votes
1 answer
220k views

SSH use only my password, Ignore my ssh key, don't prompt me for a passphrase

This is a question regarding the OpenSSH client on Linux, MacOSX and FreeBSD. Normally, I log into systems using my SSH key. Occasionally, I want my SSH client to ignore my SSH key and use a ...
Stefan Lasiewski's user avatar
4 votes
1 answer
2k views

How do I connect to MySQL when it's setting behind 2 layers of ssh?

I have a MySQL server sitting behind a bastion server that I wish to connect to from my local machine. Ideally I want to port-forward the MySQL port (3316 in this case) to a local port on my machine. ...
David Corley's user avatar
3 votes
4 answers
4k views

ssh port forwarding / security risk

I want to access a web application running on a web server behind my office firewall from an external machine. We have a bastion host running sshd that is accessible from the Internet. I want to ...
user39832's user avatar
  • 185
3 votes
3 answers
5k views

Most common account names used in ssh brute force attacks

Does anyone maintain lists of the most frequently guessed account names that are used by attackers brute-forcing ssh? For your amusement, from my main server's logs over the last month (43 313 failed ...
Charles Stewart's user avatar
5 votes
3 answers
2k views

Invalidating unused ssh keys

I am using one ssh account for all my Subversion users. They send me their public keys and I put them in .ssh/authorized_key of the svn account, then they can check out the code from Subversion using ...
Hong Jiang's user avatar
2 votes
2 answers
1k views

Two way SSH authentication

I have installed ASL and it recommends me that I implement a two way SSH authentication. I have some questions about it. I understand the general idea that you need to login with both a key and a ...
Saif Bechan's user avatar
1 vote
3 answers
384 views

Urgent SSH Local Port Redirection

I have a shell account but the admin has restricted ssh access to the server. The server is listening on 0.0.0.0:22 but the firewall blocks any incoming attempts to this port. He says he is doing ...
user avatar
2 votes
4 answers
13k views

What is the longest password for SSH?

What is the longest (how much characters) for SSH password? I like strong and long password but dont know the character limit. Thanks.
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