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I have Ubuntu 13.10 on my laptop which I would like to use to connect to my Ubuntu 12.04 desktop. I installed the open ssh server on the desktop machine using:

sudo apt-get install openssh-server

I checked that the server is running:

sudo service ssh start

and I get:

start: Job is already running: ssh

Next I checked if there is a firewall using:

sudo ufw status

and I get:

Status: inactive

Next I found out the desktop's IP address by executing:

ip addr | grep inet

and I get:

inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host 
inet 193.51.236.62/24 brd 193.51.236.255 scope global eth0
inet6 fe80::21a:a0ff:fe10:e8da/64 scope link 

So I suppose that 193.51.236.62 is my IP address.

Then on my laptop I verify that 193.51.236.62 is pingable and then I do:

ssh -v [email protected]

and I get:

OpenSSH_6.2p2 Ubuntu-6ubuntu0.1, OpenSSL 1.0.1e 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 193.51.236.62 [193.51.236.62] port 22.

And nothing else seems to be happening. Please, how can I troubleshoot this problem? What am I doing wrong?

EDIT:

I can safely ping the server machine:

martin@martin-Studio-1537:~$ ping -c3 193.51.236.62
PING 193.51.236.62 (193.51.236.62) 56(84) bytes of data.
64 bytes from 193.51.236.62: icmp_seq=1 ttl=61 time=2.82 ms
64 bytes from 193.51.236.62: icmp_seq=2 ttl=61 time=4.05 ms
64 bytes from 193.51.236.62: icmp_seq=3 ttl=61 time=4.08 ms

--- 193.51.236.62 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 2.823/3.653/4.082/0.587 ms

EDIT2:

I tried to diagnose the connection using nmap as suggested:

martin@martin-Studio-1537:~$ nmap 193.51.236.62

Starting Nmap 6.40 ( http://nmap.org ) at 2014-01-31 18:39 CET
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 3.06 seconds

and then:

martin@martin-Studio-1537:~$ nmap -Pn 193.51.236.62

Starting Nmap 6.40 ( http://nmap.org ) at 2014-01-31 18:40 CET
Nmap scan report for 193-51-236-62.lille.inria.fr (193.51.236.62)
Host is up (0.0056s latency).
Not shown: 998 filtered ports
PORT     STATE SERVICE
3128/tcp open  squid-http
8080/tcp open  http-proxy

Nmap done: 1 IP address (1 host up) scanned in 8.18 seconds
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  • Have you install OpenSSH on the server? Does the server has a firewall which blocks SSH in some way?
    – OrangeTux
    Jan 31, 2014 at 17:10
  • @OrangeTux Yes, I installed openssh-server on both computers Jan 31, 2014 at 17:12
  • Can you ping to the server?
    – OrangeTux
    Jan 31, 2014 at 17:13
  • @OrangeTux Yes, I edited my answer to include the results of a ping Jan 31, 2014 at 17:15
  • 2
    If this a public server, don't turn off the firewall (and boradcast the IP address AND the login, VERY bad idea...)... Just allow SSH through on port 22, it should do that anyway, if you configure it. Then try just ssh [email protected].
    – Wilf
    Jan 31, 2014 at 17:23

1 Answer 1

4

Start by checking to see that you can ssh into the desktop from the desktop.

ssh 127.0.0.1

If that works, I would check to see if the outside IP and internal IP are different.

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  • I tried it and I get: The authenticity of host '127.0.0.1' can't be established. ECDSA key fingerprint is ... Are you sure you want to continue connecting (yes/no)? Jan 31, 2014 at 17:18
  • There is a answer here on finding the IP address of a machine by the way.
    – Wilf
    Jan 31, 2014 at 17:21
  • That's good. That means the SSH server is running. You can safely say yes, and it should connect. Jan 31, 2014 at 17:22
  • @wilf I tried it. The external and local IP address are the same and they equal the address that I posted. Jan 31, 2014 at 17:25
  • Which you shouldn't post, as it is an external IP...
    – Wilf
    Jan 31, 2014 at 17:26

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