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)

Origine: .Net SqlClient Data Provider

   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling, SqlAuthenticationProviderManager sqlAuthProviderManager)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()
   at SFHDataComponent.SFHDataComponentConnection.Open(String ConnectionString, Boolean Asyncronous, Object FromDaemonClientObject, Boolean ReloadStructure)
   at UniversalWEBPlatform.MODDati.InizializzaConnectionBaseClass(DataClass& BaseClass, HttpResponse Response, HttpServerUtility Server, String RetHttpHostString, HttpSessionState Session, HttpApplicationState Application, Boolean LoadConnectionFromApplication)
   at UniversalWEBPlatform.MODDati.Main(HttpSessionState Session, DataClass& BaseClass, HttpServerUtility Server, HttpRequest& Request, HttpResponse& Response, HttpApplicationState& Application, Boolean CaricaParametriDaDB, Boolean ExecuteControlInMain, String RetHttpHostString, Boolean LoadConnectionFromApplication, Boolean SetLongSession)

The network path was not found