diff --git a/htdocs/admin/security.php b/htdocs/admin/security.php
index 31dce5b7ecc..5fcd0b769af 100644
--- a/htdocs/admin/security.php
+++ b/htdocs/admin/security.php
@@ -36,6 +36,8 @@ if (!$user->admin) accessforbidden();
 // Do not allow change to clear model once passwords are crypted
 $allow_disable_encryption=false;
 
+$mesg = '';
+
 
 /*
  * Actions
@@ -90,16 +92,30 @@ else if ($_GET["action"] == 'disable_encrypt')
 if ($_GET["action"] == 'activate_encryptdbpassconf')
 {
 	$result = encodedecode_dbpassconf(1);
-	if ($result > 0) dolibarr_set_const($db, "MAIN_DATABASE_PWD_CONFIG_ENCRYPTED", "1");
-	Header("Location: security.php");
-	exit;
+	if ($result > 0)
+	{
+		dolibarr_set_const($db, "MAIN_DATABASE_PWD_CONFIG_ENCRYPTED", "1");
+		Header("Location: security.php");
+		exit;
+	}
+	else
+	{
+		$mesg='<div class="error">'.$langs->trans('ConfigFilesIsReadOnly').'</div>';
+	}
 }
 else if ($_GET["action"] == 'disable_encryptdbpassconf')
 {
 	$result = encodedecode_dbpassconf(0);
-	if ($result > 0) dolibarr_del_const($db, "MAIN_DATABASE_PWD_CONFIG_ENCRYPTED");
-  Header("Location: security.php");
-  exit;
+	if ($result > 0)
+	{
+		dolibarr_del_const($db, "MAIN_DATABASE_PWD_CONFIG_ENCRYPTED");
+		Header("Location: security.php");
+		exit;
+	}
+	else
+	{
+		$mesg = '<div class="error">'.$langs->trans('ConfigFilesIsReadOnly').'</div>';
+	}
 }
 
 /*
@@ -108,6 +124,8 @@ else if ($_GET["action"] == 'disable_encryptdbpassconf')
 
 llxHeader();
 
+if ($mesg) print "$mesg\n";
+
 print_fiche_titre($langs->trans("SecuritySetup"),'','setup');
 
 print $langs->trans("GeneratedPasswordDesc")."<br>\n";
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index b642d232e27..2c94c5aeac0 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -94,6 +94,7 @@ Security=Security
 Passwords=Passwords
 DoNotStoreClearPassword=Do no store clear passwords in database
 MainDbPasswordFileConfEncrypted=Password of the database encrypted in conf.php
+ConfigFilesIsReadOnly=The file conf.php is in read only, check the rights.
 Feature=Feature
 DolibarrLicense=License
 DolibarrProjectLeader=Project leader
diff --git a/htdocs/langs/fr_FR/admin.lang b/htdocs/langs/fr_FR/admin.lang
index 89251b5c5e5..5b665f931d2 100644
--- a/htdocs/langs/fr_FR/admin.lang
+++ b/htdocs/langs/fr_FR/admin.lang
@@ -94,6 +94,7 @@ Security=S
 Passwords=Mots de passe
 DoNotStoreClearPassword=Ne pas stocker de mot de passe en clair dans la base
 MainDbPasswordFileConfEncrypted=Encrypter le mot de passe de la base dans le fichier conf.php
+ConfigFilesIsReadOnly=Le fichier conf.php est lecture seule, vérifiez les droits d'écriture.
 Feature=Fonction
 DolibarrLicense=Licence
 DolibarrProjectLeader=Chef de projet