It was the webconfig file. The auth was set incorrectly by another program.

<Security>

   <Extension Name="Windows"Type="Microsoft.ReportingServices.Authorization.WindowsAuthorization,Microsoft.ReportingServices.Authorization"/>

  </Security>

  <Authentication>

   <Extension Name="Windows"Type="Microsoft.ReportingServices.Authentication.WindowsAuthentication,Microsoft.ReportingServices.Authorization"/>

  </Authentication>