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HTTP 403 when opening Sharepoint page

When I tried to open the Sharepoint portal for a Team Foundation server 2010 Team project, I received the following 403 error:

403 

I had all the necessary rights and was connected to our domain, so I didn’t understand why this message was shown. It took me some time to find out that someone had changed the IIS server settings and changed the use of HTTPS and SSL to Required. Therefore I got an error when I connected to the website over HTTP. A more meaningful error message would have saved me a lot of time…

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