diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..86e46b4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+config_init.sh
+config_ldap.php
+config_db.php
+
diff --git a/oauth/LDAP/LDAP.php b/oauth/LDAP/LDAP.php
index d2c5e49..8fbb941 100755
--- a/oauth/LDAP/LDAP.php
+++ b/oauth/LDAP/LDAP.php
@@ -115,8 +115,10 @@ class LDAP implements LDAPInterface
         }
 
         $data = ldap_first_entry($this->ldap_server, $result);
-        if (!$data) {
-            throw new Exception('An error has occured during ldap_first_entry execution. Please check parameter of LDAP/checkLogin.');
+
+        if (!$data)
+        {
+            throw new Exception('No result from LDAP server', 404);
         }
         $dn = ldap_get_dn($this->ldap_server, $data);
         if (!$dn) {
diff --git a/oauth/resource.php b/oauth/resource.php
index 8cdd113..762c105 100755
--- a/oauth/resource.php
+++ b/oauth/resource.php
@@ -73,7 +73,17 @@ try {
     // Below is the old version, still consistent with Mattermost before version 4.4
     // $resp = array("name" => $data['cn'],"username" => $user,"id" => $assoc_id,"state" => "active","email" => $data['mail']);
 } catch (Exception $e) {
-    $resp = array("error" => "Impossible to get data", "message" => $e->getMessage());
+    if ($e->getCode() == 404) {
+	$resp = [
+	    "error" => "User not found",
+	    "message" => "$user is not in the group of authorized users."
+	];
+    } else {
+	$resp = array(
+	    "error" => "Impossible to get data",
+	    "message" => $e->getMessage()
+	);
+    }
 }
 
 // send data or error message in JSON format