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Hi Ruben Vasco,Make sure IP restrictions are disabled as well, and make sure that Permitted Users is set to "All users may self-authorize."Please refer below posts for similar discussion which has different solutions for such error see if that helps you.http://stackoverflow.com/questions/12794302/salesforce-authentication-failing http://stackoverflow.com/questions/34154385/getting-errorinvalid-grant-error-descriptionauthentication-failure-i https://help.salesforce.com/HTViewHelpDoc?id=remoteaccess_oauth_web_server_flow.htm&language=en_US Hope this helps you!Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution. Thanks and Regards Sandhya