We're developing a new MS Access 2003 application using a SQL Server 2000 back-end. The workstation running Access is Windows 2000 Workstation, and the server running SQL Server is Windows 2003 Server Std. We've been developing in this environment for weeks, but suddenly we're seeing intermittant failures in connecting to the database. For example, there is an Access form with a combobox. When we run the form and click to pull-down the list, we see the error: ODBC -- connection to TSDATA failed. where TSDATA is the name of the ODBC DSN we're using to link SQL tables. This error occurs in a variety of other places in the Access program we developed, but this is the only place where it consistently yields this error. One thing we recenlty did was to replace the SQL Server user in the DSN from "sa" to another user we created for the application. We don't see how that could have affected this issue. Any ideas!?!?! Thank you!!!!!