diff --git a/htdocs/admin/dav.php b/htdocs/admin/dav.php
index 6ac210c1ddb..005394739f0 100644
--- a/htdocs/admin/dav.php
+++ b/htdocs/admin/dav.php
@@ -68,7 +68,6 @@ $head=dav_admin_prepare_head();
 
 dol_fiche_head($head, 'webdav', '', -1, 'action');
 
-
 if ($action == 'edit')
 {
 	print '<form method="POST" action="'.$_SERVER["PHP_SELF"].'">';
@@ -76,7 +75,7 @@ if ($action == 'edit')
 	print '<input type="hidden" name="action" value="update">';
 
 	print '<table class="noborder" width="100%">';
-	print '<tr class="liste_titre"><td class="titlefield">'.$langs->trans("Parameter").'</td><td>'.$langs->trans("Value").'</td></tr>';
+	print '<tr class="liste_titre"><td>'.$langs->trans("Parameter").'</td><td>'.$langs->trans("Value").'</td></tr>';
 
 	foreach($arrayofparameters as $key => $val)
 	{
@@ -112,7 +111,7 @@ if ($action == 'edit')
 else
 {
 	print '<table class="noborder" width="100%">';
-	print '<tr class="liste_titre"><td class="titlefield">'.$langs->trans("Parameter").'</td><td>'.$langs->trans("Value").'</td></tr>';
+	print '<tr class="liste_titre"><td>'.$langs->trans("Parameter").'</td><td>'.$langs->trans("Value").'</td></tr>';
 
 	foreach($arrayofparameters as $key => $val)
 	{
@@ -177,6 +176,13 @@ if (! empty($conf->global->DAV_ALLOW_PUBLIC_DIR))
 }
 print $message;
 
+print '<br><br><br>';
+
+require_once DOL_DOCUMENT_ROOT.'/includes/sabre/autoload.php';
+$version = Sabre\DAV\Version::VERSION;
+print '<span class="opacitymedium">'.$langs->trans("BaseOnSabeDavVersion").' : '.$version.'</span>';
+
+
 // End of page
 llxFooter();
 $db->close();
diff --git a/htdocs/dav/fileserver.php b/htdocs/dav/fileserver.php
index 4e99cf92613..143f48d2033 100644
--- a/htdocs/dav/fileserver.php
+++ b/htdocs/dav/fileserver.php
@@ -72,15 +72,25 @@ $authBackend = new \Sabre\DAV\Auth\Backend\BasicCallBack(function ($username, $p
 	global $dolibarr_main_authentication;
 
 	if (empty($user->login))
+	{
+		dol_syslog("Failed to authenticate to DAV, login is not provided", LOG_WARNING);
 		return false;
+	}
 	if ($user->socid > 0)
+	{
+		dol_syslog("Failed to authenticate to DAV, use is an external user", LOG_WARNING);
 		return false;
+	}
 	if ($user->login != $username)
+	{
+		dol_syslog("Failed to authenticate to DAV, login does not match the login of loaded user", LOG_WARNING);
 		return false;
+	}
 
 	// Authentication mode
-	if (empty($dolibarr_main_authentication))
-		$dolibarr_main_authentication='http,dolibarr';
+	if (empty($dolibarr_main_authentication)) $dolibarr_main_authentication='dolibarr';
+	$dolibarr_main_authentication = preg_replace('/twoauth/', 'dolibarr', $dolibarr_main_authentication);
+
 	$authmode = explode(',', $dolibarr_main_authentication);
 	$entity = (GETPOST('entity', 'int') ? GETPOST('entity', 'int') : (!empty($conf->entity) ? $conf->entity : 1));