Error in ASP.NET 2.0 Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection

what is the connection string you use?

connection info:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="KitID"
            DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField DataField="KitID" HeaderText="KitID" ReadOnly="True" SortExpression="KitID" />
                <asp:BoundField DataField="KitNumber" HeaderText="KitNumber" SortExpression="KitNumber" />
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestADNIConnectionString %>"
            SelectCommand="SELECT [KitID], [KitNumber] FROM [FromLabKitsTable]"></asp:SqlDataSource>
also web config:

<configuration>
      <appSettings/>
      <connectionStrings>
  <add name="TestADNIConnectionString" connectionString="Data Source=IN-MMGE-HLOWRLD;Initial Catalog=TestADNI;Integrated Security=True"
   providerName="System.Data.SqlClient" />
 </connectionStrings>
      <system.web>
              
  <roleManager enabled="false" />
            <identity impersonate="true"/>
  <customErrors mode="Off"/>


            <compilation debug="true"/>
            <!--
            The <authentication> section enables configuration
            of the security authentication mode used by
            ASP.NET to identify an incoming user.
        -->
      
            <authentication mode="Windows"/>
            <authorization>
            
                  <allow roles="ADS\In-mmge-hd-admins"/>
                  <allow roles="ADS\In-mmge-hd-users"/>
                  
                  <deny users="*"/>
                  
            </authorization>
            <!--

hello anyone out there to help?

did you define the windows accounts of the users and the asp account in your sql server?

i probably didn't? what do i need to do? my first time at all this. would you be able to give me some direction. that might be it.

in the linked server? or the main sql server? any asp page i hit from the main sql server works fine. its just the linked part that doesnt.  i tested the linked server connections under my user id (using windows auth for everything)

so i thought it should work at least as me but it doesnt...

>or the main sql server?
yes, in the main sql server. open the security folder, logins, and create there the logins based on the windows accounts used (or the windows groups those users are member of).
than, grant that login the permissions in the database(s) ..

ok so i went into SQL under security i added a user login that is in my users group in ads.

then i made the db im using their defualt db.

is this what you mean or do they need something else?

now what are you saying about adding the asp account to my sql server?

ok so after adding that user to sql i am getting this error now....
seems better
Cannot open database "TestADNI" requested by the login. The login failed.
Login failed for user 'ADS\mmgehg'

this user can login into any other page that accesses the db just not this one, because this one is the linked server one. any idea what to do next?

so i just noticed when I login as ME -im the admin ---i get the null error
TCP Provider: An existing connection was forcibly closed by the remote host.
Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection.
when i login as this new user i created on sql i get the
Cannot open database "TestADNI" requested by the login. The login failed.
Login failed for user 'ADS\mmgehg'

my default db is master, mmgehg's the specific testadni db it needs.