diff --git a/check_process b/check_process
index 0cb5a4a..895ff42 100755
--- a/check_process
+++ b/check_process
@@ -21,8 +21,8 @@
 		backup_restore=1
 		multi_instance=1
 		incorrect_path=1
-		port_already_use=0
-		change_url=0
+		port_already_use=1
+		change_url=1
 ;;; Levels
 	Level 1=auto
 	Level 2=auto
diff --git a/scripts/change_url b/scripts/change_url
index f71fc77..eb7dada 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -93,6 +93,21 @@ fi
 # ...
 #=================================================
 
+# Stop writefreely for modification
+yunohost service stop $app
+
+ynh_replace_string "$old_domain" "$new_domain" "$final_path/$app/.env"
+
+# Start writefreely after modification
+yunohost service start $app
+
+### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
+### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
+ynh_backup_if_checksum_is_different "$final_path/$app/.env"
+# Recalculate and store the checksum of the file for the next upgrade.
+ynh_store_file_checksum "$final_path/$app/.env"
+ynh_store_file_checksum "$final_path/$app/.env"
+
 #=================================================
 # GENERIC FINALISATION
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 6a09d93..10f049d 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -68,8 +68,6 @@ ynh_abort_if_errors
 # Stop Plume for upgrade
 yunohost service stop "$app"
 
-
-
 #=================================================
 # CHECK THE PATH
 #=================================================