1

I'm trying to connect to a remote Ubuntu computer at work via SSH from my laptop running Ubuntu.

At first, I just tried running:

$ ssh work_name@work_machine

But nothing happened.

Searching for a tutorial on the net, I followed the instructions on this page

I suppose I need to activate the possibility for such a connection, so I typed in the terminal on my laptop

sudo service ssh start

After typing my password, I received the following message:

ssh: unrecognized service.

I wish someone could help me understand what should be done for the SSH remote connection to work.

You'reAGitForNotUsingGit
  • 14,969
Meir Zeilig-Hess
  • 33

1 Answers1

6

I'm assuming that you've already configured port forwarding and are able to get through to the machine at work.

Otherwise, even after following my answer, you won't get very far.

The SSH server is not installed by default.

You will need to install it by running these commands in a terminal (ctrl+alt+t) on the machine you wish to connect to:

sudo apt-get update
sudo apt-get install openssh-server

Then you will be able to connect normally by running:

#Replace user & IP accordingly
ssh user@192.168.3.321

However, in that state you have a security risk.

As Oli has noted here,

You need to harden it from the standard setup. I've gone through several suggestions on my blog but at the very least, I'd suggest:

  • Key-based logins. Disable password logins.
  • Move it off port 22. Use something crazy-high, in the 20000-60000 range.
  • Use fail2ban to ban people who do find it and try to brute it.

They take about 10 minutes in total and you go from a 1/10000 chance of being broken in to a probability so small, there isn't enough paper in the world to write its fraction... Assuming you're careful with your key, it has a password of its own and you don't trumpet your credentials all over the net.

If the computer is behind a router, you'll also want to do some port forwarding. This is router-specific so I'll just direct you to http://portforward.com

Community
  • 1
You'reAGitForNotUsingGit
  • 14,969