In Denodo Platform version 8, the Virtual Dataport Administration tool and Design Studio only allows the user to login into the Virtual Dataport Server without providing the database name in the connection string. For more information, refer to [Launching the Administration Tool](https://community.denodo.com/docs/html/browse/latest/vdp/administration/starting_virtual_dataport/launching_the_administration_tool/launching_the_administration_tool#:~:text=the%20database%20is%20optional) section of the Virtual Dataport Administration Guide.
However, while accessing the Virtual Dataport Server using the JDBC Driver the database name is mandatory in the connection string. Without specifying the database name in the connection string, the application that uses JDBC connection string will not be able to connect to the Virtual Dataport Server even if the server instance is Local/Remote.For more information, refer to the [Access Through JDBC](https://community.denodo.com/docs/html/browse/latest/vdp/developer/access_through_jdbc/access_through_jdbc#:~:text=The%20name%20of%20the%20database%20is%20mandatory) section of the Virtual Dataport Developer Guide.
Suppose, if your question is about the Denodo Platform Version 7, then the **database name is mandatory** in the connection string even when you connect to Virtual Dataport Server using the JDBC or Virtual Dataport Administration Tool.
Hope this helps!