ssh: Could not resolve hostname server: Name or service not known

I'm trying to test my honeypot but for some reason I'm getting this message:

ssh root@server 10.0.2.15
ssh: Could not resolve hostname server: Name or service not known

What I'm doing wrong?

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4 Answers

To connect to an ssh server in a terminal you need:

1. The call ssh to start the program
2. The user name, which in your case is root
3. An @ sign separating the user name from the server identification
4. The IP address or name of the server, which in your case is 10.0.2.15

Assembled, the command looks like:

ssh root@10.0.2.15

in general terms, ssh user@server.

Alternatively, you can use the -l option to directly specify the login name and skip the @ syntax:

ssh 10.0.2.15 -l root

As WooJoo stated, you need to tell it a valid server to connect to. If you wanted to use the form $ ssh root@server you can, but you would need to have server as an entry in /etc/hosts or your dns server (which is not the case or you would not have had an error), or an entry in a file called config located typically at /home/username/.ssh/config.

A sample /etc/hosts entry would look like:

# Sample /etc/hosts file
127.0.0.1 localhost
127.0.1.1 computerhostnamehere
10.0.2.15 server

and a sample /home/username/.ssh/config could be as simple as:

Host server HostName 10.0.2.15 User root

This would get you the basic functionality you are looking for. There are many more options available for placing in the ~/.ssh/config file.

See man ssh for more options :)

Please try by adding server entry to which you are trying to ssh in /etc/hosts file of machine from where you want to do ssh

 ssh-copy-id user@host && chmod 0755 /root (if root user) or chmod 0755 /home/username

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