I have a user who cannot refresh their reports. I ran a profiler trace and can see they are hitting the server with "ANONYMOUS LOGIN" user name, which the server is configured to disallow.
I cannot figure out why the report ( an excel spreadsheet powerpivot report) is not using the users windows domain credentials (domain\usrname) to log in.
Any ideas why the report is using ANONYMOUS, instead of windows authentication, seeing as i have specified that it use Windows Authentication?