diff --git a/README.md b/README.md
index 308fe88..6363e5c 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ How to configure this app: a plain file with SSH.
 
 For testing we can use Trickle-Ice testing tool. Go to [trickle-ice page](https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice) and enter following details.
 ```
-STUN or TURN URI : turn:<YOUR_PUBLIC_IP_ADDRESS>:5349
+TURN URI     : turn:<YOUR_PUBLIC_IP_ADDRESS>:5349
 TURN username: <YOUR_USERNAME>
 TURN password: <YOUR_PASSWORD>
 ```
diff --git a/conf/cron_coturn b/conf/cron_coturn
new file mode 100644
index 0000000..89b54ba
--- /dev/null
+++ b/conf/cron_coturn
@@ -0,0 +1,2 @@
+# Check if the IP as not changed at every 15th minute
+*/15 * * * * root bash /__DATA_PATH__/Coturn_config_rotate.sh;
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
index 6fcf136..05886ff 100644
--- a/manifest.json
+++ b/manifest.json
@@ -8,7 +8,7 @@
     },
     "version": "4.5.1.1~ynh1",
     "url": "https://github.com/coturn/coturn",
-    "license": "MIT",
+    "license": "",
     "maintainer": {
         "name": "",
         "email": ""
diff --git a/scripts/_common.sh b/scripts/_common.sh
index b293f7c..1ab2257 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -15,7 +15,6 @@ pkg_dependencies="sqlite3 libsqlite3-dev coturn acl"
 # EXPERIMENTAL HELPERS
 #=================================================
 
-
 # Send an email to inform the administrator
 #
 # usage: ynh_send_readme_to_admin --app_message=app_message [--recipients=recipients] [--type=type]
@@ -152,4 +151,3 @@ __PRE_TAG1__$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/service
 	# Send the email to the recipients
 	cat mail_to_send | $mail_bin -a "Content-Type: $content_type; charset=UTF-8" -s "$mail_subject" "$recipients"
 }
-
diff --git a/scripts/install b/scripts/install
index 971deb1..b786bf0 100644
--- a/scripts/install
+++ b/scripts/install
@@ -25,7 +25,6 @@ ynh_abort_if_errors
 
 domain=$YNH_APP_ARG_DOMAIN
 path_url="/"
-#admin=$YNH_APP_ARG_ADMIN
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -36,7 +35,7 @@ ynh_script_progression --message="Storing installation settings..." --weight=4
 
 ynh_app_setting_set --app=$app --key=domain --value=$domain
 ynh_app_setting_set --app=$app --key=path --value=$path_url
-#ynh_app_setting_set --app=$app --key=admin --value=$admin
+ynh_app_setting_set --app=$app --key=no_sso --value true
 
 #=================================================
 # CREATE A DH FILE
@@ -146,12 +145,30 @@ fi
 
 ynh_store_file_checksum --file="$coturn_config_path"
 
+#=================================================
+# ADD SCRIPT FOR COTURN CRON
+#=================================================
+
+# WARNING : theses command are used in INSTALL, UPGRADE
+# For any update do it in all files
+data_path="/home/yunohost.app/$app"
+mkdir -p $data_path
+cp -f ../sources/Coturn_config_rotate.sh $data_path/
+chmod +x $data_path/Coturn_config_rotate.sh
+
+#=================================================
+# SET COTURN CRON
+#=================================================
+
+cp -f ../conf/cron_coturn /etc/cron.d/$app
+ynh_replace_string --match_string="__DATA_PATH__" --replace_string=$data_path --target_file=/etc/cron.d/$app
+
 #=================================================
 # SETUP LOGROTATE
 #=================================================
 ynh_script_progression --message="Configuring log rotation..." --weight=1
 
-ynh_use_logrotate
+ynh_use_logrotate --logfile "/var/log/$app"
 
 #=================================================
 # GENERIC FINALIZATION
@@ -160,11 +177,9 @@ ynh_use_logrotate
 #=================================================
 
 # Set permissions to app files
-#chown -R root /var/log/$app
-#hown -R root /etc/$app
-#chmod -R u=rwX,g=rX,o= /etc/$app
-#setfacl -R -m user:turnserver:rX  /etc/$app
-#setfacl -R -m user:turnserver:rwX  /var/log/$app
+chown root: -R $data_path
+chown -R turnserver:root /var/log/$app
+setfacl -R -m user:turnserver:rwX  /var/log/$app
 
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
diff --git a/scripts/remove b/scripts/remove
index 4212dd4..28f82b8 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -17,11 +17,8 @@ ynh_script_progression --message="Loading installation settings..." --weight=1
 app=$YNH_APP_INSTANCE_NAME
 
 domain=$(ynh_app_setting_get --app=$app --key=domain)
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 turnserver_tls_port=$(ynh_app_setting_get --app=$app --key=turnserver_tls_port)
 turnserver_alt_tls_port=$(ynh_app_setting_get --app=$app --key=turnserver_alt_tls_port)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-db_user=$db_name
 
 #=================================================
 # STANDARD REMOVE
@@ -42,7 +39,6 @@ fi
 ynh_script_progression --message="Stopping and removing the systemd service..." --weight=1
 
 # Remove the dedicated systemd config
-#ynh_remove_systemd_config
 ynh_remove_systemd_config
 
 #=================================================
@@ -56,11 +52,9 @@ ynh_remove_app_dependencies
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================
-ynh_script_progression --message="Removing Coturn main directory..." --weight=2
+ynh_script_progression --message="Removing Coturn configuration file..." --weight=2
 
-ynh_secure_remove --file=/var/log/$app
-
-ynh_secure_remove --file=/etc/turnserver.conf
+ynh_secure_remove --file="/etc/turnserver.conf"
 mv /etc/turnserver.conf.orig /etc/turnserver.conf
 
 #=================================================
@@ -71,6 +65,25 @@ ynh_script_progression --message="Removing logrotate configuration..." --weight=
 # Remove the app-specific logrotate config
 ynh_remove_logrotate
 
+#=================================================
+# REMOVE SCRIPT
+#=================================================
+
+# Remove coturn/Coturn_config_rotate.sh 
+ynh_secure_remove --file="/home/yunohost.app/$app"
+
+#=================================================
+# REMOVE CRON JOB
+#=================================================
+# Remove a cron file
+ynh_secure_remove --file="/etc/cron.d/$app"
+
+# Remove the log files
+ynh_secure_remove --file="/var/log/$app/"
+
+# Remove the sqlitedb file
+ynh_secure_remove --file="/var/lib/turn/"
+
 #=================================================
 # CLOSE A PORT
 #=================================================
@@ -96,7 +109,7 @@ closeport() {
 ynh_script_progression --message="Removing the dedicated system user..." --weight=1
 
 # Delete a system user
-deluser turnserver ssl-cert
+ynh_system_user_delete --username=turnserver
 
 #=================================================
 # END OF SCRIPT
diff --git a/sources/Coturn_config_rotate.sh b/sources/Coturn_config_rotate.sh
new file mode 100644
index 0000000..f1351d6
--- /dev/null
+++ b/sources/Coturn_config_rotate.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+source /usr/share/yunohost/helpers
+
+external_IP_line="external-ip=__IPV4__,__IPV6__"
+
+public_ip4="$(curl ip.yunohost.org)" || true
+public_ip6="$(curl ipv6.yunohost.org)" || true
+
+if [ -n "$public_ip4" ] && ynh_validate_ip4 --ip_address="$public_ip4"
+then
+    echo "external-ip=$public_ip4" >> "$coturn_config_path"
+fi
+
+if [ -n "$public_ip6" ] && ynh_validate_ip6 --ip_address="$public_ip6"
+then
+    echo "external-ip=$public_ip6" >> "$coturn_config_path"
+fi
+
+old_config_line=$(egrep "^external-ip=.*\$" "/etc/turnserver.conf")
+ynh_replace_string "^external-ip=.*\$" "$external_IP_line" "/etc/turnserver.conf"
+new_config_line=$(egrep "^external-ip=.*\$" "/etc/turnserver.conf")
+
+#setfacl -R -m user:turnserver:rX  /etc/$app_instance
+
+if [ "$old_config_line" != "$new_config_line" ]
+then
+    systemctl restart $app.service
+fi
+
+exit 0