diff --git a/lib/passport/index.js b/lib/passport/index.js
index d6b60ffdb..9509b99d9 100644
--- a/lib/passport/index.js
+++ b/lib/passport/index.js
@@ -52,6 +52,8 @@ function authenticate_user(args){
       .then(function(ldap_server){
 
       ldap_server.authenticate(email, password, function (err, u) {
+        ldap_server.close();
+
         if (err) {
           console.log("LDAP auth error: %s", err);
           return done(null, false);