Login to Provisioning Portal using XCode

hope someone is able to help me with this. I am trying to use automatic provisioning through开发者_开发知识库 xcode's organizer. Whenever I click on it, it prompts me to log in to the developer portal. I entered my credentials but it keeps popping up, as though my credentials are incorrect. I have checked that my credentials are correct because I am able to log in to the portal through the website.

Does anyone have a solution to this?