I am using the .NET 8 Blazor web app template. I have been programming locally for a while with no issues. I recently tried to deploy my web app to azure, however I keep running into an error
Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user.
I know the connection string is correct as I have testing the exact same appsettings locally with no issue, so issue must be server related.
The issue seems to occur for about 5 mins after the code has been published or the app has been restarted. After this period I can log in, but then the error will sometimes appear. Usually it happens when sending multiple calls to the database in one go.
To account for this, I added delays between database calls to see if this would fix the issue. It appears to make the issue better but it still can occur.
I am currently using a DbContextFactory as I saw online this allowed for multiple calls to the database from different components which is a feature I would like to keep.
Further the issue seems to go away when setting TrustServerCertificate=True, but I do not want to leave this on as this will be used in production (not 100% sure this solves the issue as the problem is intermittent, hasn't failed since trying).
I am hoping this is something that can be fixed with connection string setting, please let me know.
The problem itself is very intermittent. Sometimes I can go 20min with no issue, and sometimes it will fail every time. Seems to fail most often when I haven't touched it in a while. Always on is selected in azure so this shouldn't be an issue I think.
My database is hosted on Azure.
Error details:
2025-05-07 08:19:37.526 [Error] Microsoft.EntityFrameworkCore.Query: An exception occurred while iterating over the results of a query for context type 'My.Run.DBContext'.Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user 'dummyuser'. at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, SqlCommand command, Boolean callerHasConnectionLock, Boolean asyncClose) at Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at Microsoft.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at Microsoft.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) at Microsoft.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, TimeoutTimer timeout, Boolean withFailover) at Microsoft.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) at Microsoft.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) at Microsoft.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling, String accessToken, DbConnectionPool pool, Func`3 accessTokenCallback) at Microsoft.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) at Microsoft.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) at Microsoft.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at Microsoft.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at Microsoft.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) at Microsoft.Data.ProviderBase.DbConnectionPool.WaitForPendingOpen()