While Deploying Metadata in your Org thru ANT tool fails with below error, even though you have enter the right username and password with security token and URL. BUILD FAILED D:\Salesforce Migration Tool\salesforce_ant_38.0\sample\build.xml:60: Invalid username, password, security token; or user locked out. In this case, its quite possible that, you are deploying Apex classes to production environment, and total test coverage is not greater than 75% or all the Classes or not covered with test classes. In case you are deploying to another sandbox or dev environment then you don't need to test your classes.