Rather urgent: Cannot open user default database. Login failed.

On an ASP.Net 2.0 appliaction, I use ASPNETDB.mdf in the project's
App_Data subdirectory for forms authentication. This works fine inside

Visual Studio 2005.

When I deploy the application to an IIS server on the same computer,
I cannot open ASPNETDB.mdf. I get the usual message:

Cannot open user default database. Login failed.

On that particular computer, I have MS SQL 2005 Express installed.

I assume the solution is an easy one. It may be that ASPNETDB.mdf
should be attached to the database server for use outside
Visual Studio, but I just can't get there. Also, what settings should
be made, assuming it should be attached? For instance, do I add
[computer name]\ASPNET as a user for ASPNETDB.mdf?

Thanks in advance for any help!

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