When attempting to generate a web based report there is a prompt for entering a user name and password to access the data source:
ION Enterprise 6.x
Login credentials are changed or may not be specified to that WebReporter (Reporting Services) can access the IONReportDataSource.
Follow the procedure below to set the correct login credential.
1. Open the web browser and open the https://<server name>/Reports or https://<server name>/Reports$ION virtual root.
2. Open the IONReportDataSource.
3. Under the Connect Using, select the radio button "Credentials stored securely in the report server".
4. Enter the following user information:
User Name: IONUser
5. Click on Apply to apply the changes.