WebInterface SBS 2011?

Has anyone had success setting up the web-interface v9, IIS within the SBS 2011 environment? I have tried several times but get the Error 503. I think it may be because I'm not using the proper username? Any insight would be helpful.
Thanks
D

Thank you for asking. Please review the troubleshooting guide for this specific error - IIS Error 503.

Hope this helps.