Could not connect to the database

Exception
System.Data.SqlClient.SqlException (0x80131904): 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) ---> System.ComponentModel.Win32Exception (0x80004005): Access is denied
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   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 Dynamicweb.Data.DatabaseConnectionProvider.CreateConnection()
   at StandardWebshop.CustomCode.Solution.Factory.GlimpseDatabaseConnectionManager.CreateConnection() in D:\VSO Agents\00TFS01-norriq\_work\43\s\Src\StandardWebshop\CustomCode\Solution\Factory\GlimpseDatabaseConnectionManager.cs:line 19
   at Dynamicweb.Content.Management.Setup.CanConnectToDatabase(String server, String database, String username, String password, String connectionString, Boolean useIntegratedSecurity) in D:\sources\Dynamicweb\Dynamicweb9\06 - Dynamicweb Host\Dynamicweb\Dynamicweb-9.3\Dynamicweb\Content\Management\Setup.vb:line 106
ClientConnectionId:00000000-0000-0000-0000-000000000000
Error Number:5,State:0,Class:20