"You need to contact Qualys and make sure the user account you are using has access to the KB and Vulnerability APIs. This isnt enabled by default, nor is it free. Additionally, they may have you enabled on a different API host depending on your region and services you subscribe to."
In Qualys Under the user you are trying to connect with, go to User Role and Ensure you have the API box checked. If it's the same as your Sourcefire user, it's probably OK. Also, make sure you used the correct endpoint platform in the setup screen.
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