diff --git a/scripts/install b/scripts/install
index f10f800..7314611 100644
--- a/scripts/install
+++ b/scripts/install
@@ -61,7 +61,7 @@ ynh_print_info "Configuring firewall..."
 # Find a free port
 port=$(ynh_find_port 4242)
 # Open this port
-ynh_exec_warn_less yunohost firewall allow --no-upnp TCP $port
+#ynh_exec_warn_less yunohost firewall allow --no-upnp TCP $port
 ynh_app_setting_set $app port $port
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 8df02ad..355b760 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -38,6 +38,16 @@ if [ -z "$port" ]; then
 	ynh_app_setting_set $app port $port
 fi
 
+#=================================================
+# CLOSE A PORT
+#=================================================
+
+if yunohost firewall list | grep -q "\- $port$"
+then
+	ynh_print_info "Closing port $port"
+	ynh_exec_warn_less yunohost firewall disallow TCP $port
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================