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If the user running the application pool does not have the rights to create a database on the SQL instance, it will not be able to create the server database the first time you access the web application. You will get the following error message:
Solution
To solve this , the application pool user need sufficient privileges in the database:
- open the SQL Server Management Studio and
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- connect to the database instance used when mounting databases
- expand Security / Logins
- right-click on the IIS application pool identity
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- setup for the application - it is often the NT AUTHORITY\SYSTEM user
- select Properties and Server Roles
- include the server role: sysadmin to enable the application to handle databases
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