Error Message:
The Microsoft Dynamics NAV server is currently not ready to serve requests. Try again later or contact your system administrator.
Problem Statement:
System returns above error message when you try to Connect to NAV Database and Stops the Running service.
Solution:
Open SQL Management
Go to Security -> Logins -> find the login used by the NAV Server (e.g. Network Service) -> Properties -> User Mapping -> find the database and select db_owner in the "Database role membership".