Error "This operation is not supported....."

[pir8radio 1312]

Win 7 reverse proxy IIS, i type a user name and a wrong password in i get this error, but not when accessing the server directly...   what does it mean, and why do i see this?  Thanks,

 

 

 

[Luke 42078]

please see http://mediabrowser.tv/community/index.php?/topic/790-how-to-report-a-problem/