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Error occurred in deployment step 'Add Solution': Attempted to perform an unauthorized operation.

Received this error today when trying to create a SharePoint solution against a newly created site. My first problem was the site was configured to use a port which was already used by another web site. Therefore the site could not start at all. In my case both Default Web Site and SharePoint - 2000 was both using port 2000. Changing the port of Default Web Site and I was able to start the site. However now I still received the same error message. When browsing the site I realized I did not have access to the site. Giving access to my user and I was able to deploy the solution. To sum up this post:  - Check the site can start  - Check the site can be browsed  - Check your user have access to the site