Unable to connect to Azure SQL Server from custom edge module.

Hi Team,

Our customer cannot connect to the Azure SQL server from a custom edge module running on IoT Edge. The custom module gives an error while opening a connection towards the server using the function <conn.Open();>

Please find their below error.

BackgroundService failed System.Data.SqlClient.SqlException (0x80131904): Login failed for user 'username'. at System.Data.ProviderBase.DbConnectionPool.CheckPoolBlockingPeriod(Exception e) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) 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, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) at System.Data.SqlClient.SqlConnection.Open() at sqlfunction.ModuleBackgroundService.ExecuteAsync(CancellationToken cancellationToken) in /app/ModuleBackgroundService.cs:line 46 at Microsoft.Extensions.Hosting.Internal.Host.TryExecuteBackgroundServiceAsync(BackgroundService backgroundService) C5"

Start with ModuleBackgroundService.cs at line 46, where SqlConnection.Open() fails, and review the reported Azure SQL login error in the context of the custom IoT Edge module. Reproduce the connection attempt with the supplied setup and determine what authentication or configuration detail causes the login failure; done means the module opens the connection successfully or the required limitation is documented.