Problem connecting to a site collection using SharePoint Designer 2010

Got a weird error when I tried to connect to a SharePoint 2010 site collection:

"An error occurred while trying to fetch data from your sharepoint site" + "The status is 'OK'"

No it's not ok!

Looking at different blog posts several suggestions were provided: different build version, IIS binding issues, and so on.

BUT what fixed it in my case was these steps (suggested by JacobEgholm):

  • In IIS select authentication for the web app that causes you headaches

  • Select Windows Authentication

  • Select Advanced settings and turn off Extended protection

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