pls i have this error40
an error linked to network or specific in authority waiter occurred during the establishment of a connection in sql server .le is a discovered or is not approachable, prove that the name of authority is correct and that sql server am configuré to allow connection distant (provider:fournisseur of channels called, errer:40-impossible to open a connection in sql server)
It's basically saying that it couldn't find the instance you specified in your connection string. One possibility, as specified in the error message, is that the instance is not configured to allow remote connections. Is the database instance on the same machine as the application? Can you connect to the instance using Management Studio?