Object Browser history - connection error

Hi Team,

I have a question partially related to the software but partially to the connectivitiy with the DB.

I am trying to access the history data, either from Object Browser, or from Manager. Current data are loaded correctly, I can read and write perfectly, but when I open the History tab to get the past data or how the object has changed over the months, I get the following error:

Database error 53: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

We have only 2 servers, the DB and the service. 

I've tried to open all firewalls, but nothing.

If you have any idea where to direct the search. Danke!

Regards,

Frank