Error Message seems to be pretty straightforward. Did you verify that you are indeed properly configured to connect to the database? Configuration section of your DataBase thing.
I have checked my database connection and it is showing status as connected.
I am connecting to my local database and this is the connection url string by using this connection url string in properties it i showing status as connected.
Unfortunately the isConnected is not a good indicator. (Bug sorry)
I don't see a port defined in your connection string, so I think that may need to be fixed.
To check if you are actually connected, when you are setting up an SQL Query or Command, go to Tables/Columns tab and see if actual content shows up. If there is, you are connected.
Also look at the application log to check for errors.