A call to system.Data.SqlClient.sqlConnection.Open failed with this message: Good day sir, please I have attached a screen capture of error I got when completing the upgrade of my database. I got this error when I clicked on ‘Test database connection’. Please, any idea of what ought to have done which I never did. thanks and kind regards. Sanusi

I’m not able to see the screenshot, can you post it again so we can have an overview of the complete error?

Are you upgrading to NAV 2013 or NAV 2013 R2?

see here : http://www.mibuso.com/forum/viewtopic.php?f=32&t=57924&view=previous