[AC-1382] ACS Invalid Request error with no log in the managment console

I am trying to store some data on Custom Object of Appcelerator ACS. So there will be a service to do that. Each time it require authentication to create a new object But I am sometime getting below error while login with ACS. But it not occuring always. It only if I call service multiple time. error i am getting is: { success: false, error: true, code: 400, message: "Invalid request sent." } Code used to login : ACS.Users.login(userData, function(data){ if(data.success) { console.log("----------Successful to login.---------------"); console.log(data); res.send(data); res.end(); } else { console.log("------------------login failed---------------"); console.log(data); res.send(data); res.end(); } },req, res); Can some one can help me to understand how to re-use session id from node.ACS web service app (Not web app)? How I can keep session / check session validity before pushing something to custom object? Has anyone faced similar issue? Thanks Peter