diff --git a/scripts/config b/scripts/config
index 1603614..28795cd 100644
--- a/scripts/config
+++ b/scripts/config
@@ -17,19 +17,6 @@ ynh_abort_if_errors
 
 set__expose_port_53() {
 
-    if [ "$expose_port_53" == "true" ]; then
-        ynh_print_info --message="Opening port 53..."
-        # if the user would expose port 53 to the Internet, open it
-        ynh_exec_warn_less yunohost firewall allow Both 53
-    elif [ "$expose_port_53" == "false" ]; then
-        # else if false, close it
-        ynh_print_info --message="Closing port 53..."
-        ynh_exec_warn_less yunohost firewall disallow Both 53
-    else
-        # else, throw error
-        ynh_print_warn --message="The variable 'expose_port_53' should be 'true' or 'false' but isn't, please report this."
-    fi
-
     # regenerate config, needed to add or delete public IPs following the user's choice
 
     ynh_print_info --message="Obtaining IP addresses for the AGH config file..."
diff --git a/scripts/install b/scripts/install
index 6f28b8b..a6fc925 100644
--- a/scripts/install
+++ b/scripts/install
@@ -29,8 +29,13 @@ fi
 
 ynh_app_setting_set --app="$app" --key=dns_over_https --value="$dns_over_https"
 
-ynh_print_info --message="Opening port 53..."
-ynh_exec_warn_less yunohost firewall allow Both 53
+
+# if the port 53 is not open, open it, it's mandatory to use AGH
+if ! yunohost firewall list | grep -q " 53$"; then
+    ynh_print_info --message="Opening port 53..."
+    ynh_exec_warn_less yunohost firewall allow Both 53
+fi
+
 if [[ $expose_port_53 == 0 ]]; then
     expose_port_53="true"
 else
diff --git a/scripts/restore b/scripts/restore
index c3a5e64..af315a0 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -22,8 +22,10 @@ if [ "$dns_over_https" == "false" ]; then
     ynh_exec_warn_less yunohost firewall disallow UDP "$port_dns_over_quic"
 fi
 
-if [ "$expose_port_53" == "true" ]; then
-	# if expose_port_53 is true, we need to open port 53
+
+# if the port 53 is not open, open it, it's mandatory to use AGH
+if ! yunohost firewall list | grep -q " 53$"; then
+    ynh_print_info --message="Opening port 53..."
     ynh_exec_warn_less yunohost firewall allow Both 53
 fi
 
diff --git a/scripts/upgrade b/scripts/upgrade
index c49cf15..0a3d6ed 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -29,18 +29,21 @@ ynh_systemd_action --service_name="$app" --action="stop"
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
+# if the port 53 is not open, open it, it's mandatory to use AGH
+if ! yunohost firewall list | grep -q " 53$"; then
+    ynh_print_info --message="Opening port 53..."
+    ynh_exec_warn_less yunohost firewall allow Both 53
+fi
+
 if [ -z "${expose_port_53:-}" ] && [ "${expose_port_53:-}" = true ]; then
     expose_port_53="true"
 	ynh_app_setting_set --app="$app" --key=expose_port_53 --value="$expose_port_53"
-	# if expose_port_53 is true, we need to open port 53
-    ynh_print_info --message="Opening port 53..."
-    ynh_exec_warn_less yunohost firewall allow Both 53
 elif [ -n "${expose_port_53:-}" ] || [ "${expose_port_53:-}" = false ]; then
     expose_port_53="false"
 	ynh_app_setting_set --app="$app" --key=expose_port_53 --value="$expose_port_53"
-	ynh_print_info --message="Port 53 is closed."
 fi
 
+
 if [ -z "${dns_over_https:-}" ] && [ "${dns_over_https:-}" = true ]; then
 	dns_over_https="true"
 	ynh_app_setting_set --app="$app" --key=dns_over_https --value=$dns_over_https