linux@linux-laptop:~$ sudo /etc/init.d/ssh start
[sudo] password for linux:
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service ssh start

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start ssh



What does this mean??

Remote-Host is my own system(linux-laptop) or the system which I am tying to connect(linux-desktop)

It means you can use the command:
sudo service ssh start

FYI you need to run this command on the desktop. This starts the ssh server.

linux@linux-laptop:~$ sudo service ssh start
[sudo] password for linux:
start: Job is already running: ssh


It tells me as ssh is running already. But now if I want to connect to other system how can I do??
I want to use other system terminal how is it possible?

What distribution / version is running on the desktop?
The ssh server must be installed and running on the desktop.

After reading through this thread, it seems the OP is confused....

On your desktop, perform the following:
Now from your laptop, enter the following:
Just replace 192.168.1.50 with the actual IP address of your desktop, and replace user with the real username you need to use to log in. It will ask for your password, and then you will be able to access your desktop via SSH.

Cheers,

Josh

linux@linux-laptop:~$ sudo service ssh start
[sudo] password for linux:
start: Job is already running: ssh
linux@linux-laptop:~$ ssh shelluser@210.212.246.46
ssh: connect to host 210.212.246.46 port 22: Connection timed out


Why does it gives me an info as timed out?
When I use hostname instead of IP I am getting connected to my system through ssh. But now if I want to connect to other system by knowing their IP and password How can it be done..
Please do help me..

I agree the OP is a bit confused so lets start over.

To connect to the desktop the ssh server must be running on that computer. The command "sudo service ssh start" needs to be run from the desktop not the laptop. You never responded as to what distribution is running on the desktop. Make sure that if you are running a firewall on the desktop that you have allowed incoming ssh traffic.

A connection timed out error means the client could not talk to the server. Either the server is not running, the port number is incorrect or the firewall is blocking traffic.

What system? Please be more specific. Desktop or laptop?

Now I want to connect my linux laptop and my friend's laptop. Through ssh How can I do that.
I have installed ssh server in both the laptop's. Now when I try to connect to my friend' laptop It tells me as
"could not resolve hostname: name or server not known"
What should I do. Should I check DNS connection or something else?

Will need more information.
Are both laptops on the same LAN?
If not on the same LAN is the friend's laptop behind a firewall?
Do you know your friend's IP address?

Both the laptop's are in the same LAN network. I know my friends IP address. I doesnot know if her laptop is behind the firewall. How do I check it?

Did you try connecting with the IP address?
If running ubuntu the firewall I believe is disabled by default.
http://www.ubuntugeek.com/gufw-simpl...-firewall.html

Ubuntu, by default, is pretty locked down. The OP should be able to ping the machine though; Can you post the results of a five second ping to the server? I just want clarification of ruling out the obvious so we have some ground to work off of.

My bad, I don't mess with Ubuntu much.

I dont understand. What you mean by the result of five second ping to the server?