can't see role in production version 2.0 (ms sql 2005)

Worked in development but not on production site. I'm testing roles in a
couple of pages:

if My.User.IsInRole("adminstrators") then
'do stuff or not

Like I said, this all works fine in development.

When I run it on the remote server I can log in and it finds the user and
the login process seems fine but it cannot see the role for some reason.

I put this in the Page_Load event of my default page:

Response.Write("name: " & My.User.Name)
Response.Write("; role: " & String.Join(",",

the Role comes up blank (in production version)

Can anyone tell me what might be wrong?