Mike,<br><br>First reinitialize the &quot;known_hosts&quot; file by the following from your ssh client box:<br><br>cd ~/.ssh<br>rm known_hosts<br>ssh &lt;username&gt;@&lt;IP address of ssh host box&gt;<br>   - Ubuntu will ask you for confirmation of your request to setup a key on the server -<br>

Type yes or &#39;y&#39; which ever it asks for<br>type in password when prompted<br>   - you should now have prompt for &lt;username&gt;@&lt;ip address of ssh host box&gt;:$<br><br>This should rewrite the known_hosts file in your user directory on the client box<br>

<br>At this point you should be able to ssh into your host by using the &lt;username&gt;@ip address of host box&gt;<br><br>If you can&#39;t than perhaps you setup up public keys for authentication. If you have public keys setup than you should see 2 files named &quot;id_rsa&quot; and &quot;id_rsa.pub&quot; on your ssh client machine in a directory named &quot;/home/&lt;username&gt;/.ssh&quot;. id_rsa is your private key that needs to remain here.  The id_rsa.pub is the public key that needs to be copied to your ssh server.  If you see the id_rsa.pub file and you still know your passphrase that you setup (if you set one up) than it is a matter of appending id_rsa.pub into a file called &quot;authorized_keys&quot; located in ~/.ssh on the host computer.  If you only have the single client connected to the host than you can rename the authorized_keys file on your host and append id_rsa.pub to a new version. NOTE if you do not see the id_rsa.pub file and only have the id_rsa file than you will need to generate a new set of public keys (see Method 2).  <br>

<br><br>Method 1<br>If you have been able to establish simple ssh between the 2 boxes, from the client computer (where id_rsa.pub is found) it might be as simple as typing the following: <br><br>ssh &lt;username&gt;@host ip address&gt; &quot;cat &gt;&gt; ~/.ssh/authorized_keys&quot; &lt; ~/.ssh/id_rsa.pub<br>

<br>or after establishing an ssh connection typing the following:<br><br>&quot;cat &gt;&gt; ~/.ssh/authorized_keys&quot; &lt; ~/.ssh/id_rsa.pub<br><br>If ssh is not working you will need to get the id_rsa.pub onto the host computer and append it from there.  Logon to host computer as user to be authenticated and copy the file using &quot;scp&quot; command and place it in the ~/.ssh directory.  <br>

<br>Method 2 (New keys)<br><br>To generate new keys type the following from the client box (do not do this using sudo or as root but as your own username):<br><br>ssh-keygen -t rsa<br>  - Ubuntu will prompt you for the location to place the key pairs just pick the default<br>

  - You will be prompted for a passphrase<br>  -  You will be asked for passphrase confirmation<br>  <br> Then copy the id-rsa.pub file to the host computer by Method 1.<br><br>-- <br>James<br><br><br>