Your sql server is setup for windows authentication (the preferred default). Try setting authentication to sql server mode or mixed mode in the server properties in enterprise manager. Alternatively, you may be able to give your windows account a sql login - this is cofigured in sql enterprise manager logins.
>Have you encountered this problem when trying to connect to SQL Server 2000 with .NET?
>Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection.
>Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
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>Exception Details: System.Data.SqlClient.SqlException: Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection.
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>Source Error:
>An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
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>Not sure why this keeps happening... Anyone have any ideas.?