Application Name: Open Concept Lab
Question: Not able to Log In(http://localhost:8080/login) in OCL says “No such user or wrong password.”
And If I tried to Sign Up 
what could be the problem
By default (for whatever reason) the client tries to connect to demo.openconceptlab.org rather than qa. You can fix that by creating a file called env.config in the public dir with contents like:
var OCL_API_HOST = "https://api.qa.openconceptlab.org";
var TRADITIONAL_OCL_HOST = "https://qa.openconceptlab.org";
env-config.js is already there
and this problem occurred today only.
before that, it was working fine.