diff --git a/tutos/computer.txt b/tutos/computer.txt
index 8e05601..3ad283a 100644
--- a/tutos/computer.txt
+++ b/tutos/computer.txt
@@ -271,14 +271,30 @@ find | sort | grep -ve "node_modules/" -e ".git/" | sed 's#[^/]*/#|__ #g;s#__ |#
 	- add vimrc, zshrc, and screenrc in default screen windows
 
 **ecowan server :**
+	- list user : **cat /etc/passwd**
+	- change user passwd : **sudo passwd <username>**
 	- changed user "root" and "ecowan" password
-	  - sudo passwd username
-	- created "huho" user (with same passwd)
-	- added it to the sudo group so it can use sudo (`sudo usermod -aG sudo huho`)
+		- **sudo passwd username**
+	- created "huho" user with **sudo adduser <username>**
+	- added it to the sudo group so it can use sudo (**sudo usermod -aG sudo huho**)
 	- did not add it to the sudoers file (`visudo` then add line `huho ALL=(ALL) ALL`)
-	- disabling user "ecowan" shell access with `sudo usermod --shell /sbin/nologin ecowan`
-	  - https://unix.stackexchange.com/questions/10852/whats-the-difference-between-sbin-nologin-and-bin-false#10867
-		- its possible to re-enable it with `sudo usermod --shell /bin/bash ecowan` 
+	- disabling user "ecowan" shell access with **sudo usermod --shell /sbin/nologin ecowan**
+		- https://unix.stackexchange.com/questions/10852/whats-the-difference-between-sbin-nologin-and-bin-false#10867
+		- its possible to re-enable it with **sudo usermod --shell /bin/bash ecowan** 
+		- to see the shell of a user : **grep <username> /etc/passwd**
 	- added ssh pub key by running this command in local :
-	  - ssh-copy-id username@server_ip
+		- **ssh-copy-id username@server_ip**
+		- then changed ssh configuration file `/etc/ssh/sshd_config` to enable ssh key connection only :
+			- Set PasswordAuthentication no to disable password-based authentication
+			- Set ChallengeResponseAuthentication no to disable any keyboard-interactive authentication
+			- Ensure that PubkeyAuthentication yes is set to allow public key authentication
+			- restart ssh with **sudo service ssh restart**
+	- create a new user "user_sav" with the same ssh key to have a backup connection
+	- if i wanted i should change file `/etc/ssh/sshd_config`, and add the 3 commented lines :
+		- #Match User user_sav
+			#PasswordAuthentication yes
+			#Match all
+			PasswordAuthentication no
+			PermitEmptyPasswords no
+		- to let user_sav be able to connect with a password instead of a ssh key