|Deployment notes and tools / Commerce Server Installation|
Web applications built on Commerce Server or the Commerce Server Web Services require access to the administration database, named MSCS_Admin by default, for configuration information, including the database connection strings for the other Commerce Server databases.
<connectionStrings> <add name="ADMINDBPS" connectionString="<your MSCS_Admin connection string" /> </connectionStrings>
This connection string should be the same for your web application and all Commerce Server web services. You should use Commerce Server Manager to change the administration database connection string to match the entry in the web.config.
For reg-free COM deployments, adding the ADMINDBPS connection string is required.