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--- wiki:obsolete:x2goserver-home-ubuntu-installation [2010/12/19 14:54]
bmullan Adding warning about ssh config change on remote desktop server
+++ wiki:obsolete:x2goserver-home-ubuntu-installation [2013/03/12 20:23]
sunweaver removed
@@ Line 23: / Line 23: @@
 > For Ubuntu x2go Server use as a remote desktop.
-If you have been you seeing an x2go connection failure message such as:
+If you have been you seeing an x2go connection failure message to the Server "a.b.c.d" such as:
 **Connection failed a.b.c.d: Failed to add the host to the list of known hosts (/home/userID/.ssh/known_hosts). Permission denied (publickey).**
 Then the following may be the cause of your failure.  If you plan to log in to a remote Ubuntu x2go "server" machine (lets call it "TargetDesktop") there is one SSH configuration setting (/etc/ssh/sshd_config) on TargetDesktop that you will want to change.
-Using a text editor as (nano, gedit) edit sshd_config and change the following.   The first will allow a user connection using a login ID and password (re Challenge/Response) from the x2go "clients".   The Second is a general good practice.
+Using a text editor as (nano, gedit) edit sshd_config and change the following.   The First will allow a user connection using a login ID and password (re Challenge/Response) from the x2go "clients".   The Second is considered a generally good practice.
 **1)** edit the TargetDesktop machine's /etc/ssh/sshd_config file:
@@ Line 36: / Line 35: @@
 **sudo gedit /etc/ssh/sshd_config**
+//Ubuntu default is:  ChallengeResponseAuthentication no//
-//Ubuntu default is:  ChallengeREsponseAuthentication no//
 # Change to "yes" to enable challenge-response passwords (beware issues with
@@ Line 48: / Line 46: @@
 If you have configured your Server correctly you would already have made User(s) a member of the admin and adm groups which gives that user(s) the ability to use //sudo//.   With that there's really no need for direct root login so disable it.
-# Authentication:
+NOTE: in this section of the sshd_config file the Ubuntu default is 'yes' for
-LoginGraceTime 120
+//PermitRootLogin yes//  --> Change it to "no"
-# NOTE:  //in Ubuntu default is 'yes' for - PermitRootLogin yes//
-# Change it to "no"
+  * Authentication
-**PermitRootLogin no**
+  * LoginGraceTime 120
-StrictModes yes
+  * **PermitRootLogin no**
+  * StrictModes yes
 Save the file and exit the editor.
-Finally, restart the SSH server on the TargetDesktop machine so both the changes take effect using the following command:
+**Finally, remember to restart the SSH server on the TargetDesktop machine so both the changes take effect** using the following command:
-**
-sudo /etc/init.d/ssh restart**
+**sudo /etc/init.d/ssh restart**
 The first change above should now permit your x2go clients to log in.

X2Go - everywhere@home

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