В настоящее время у нас периодически возникает проблема с нашим веб-сайтом ASP.NET (построенным на Sitecore), когда веб-сайт не может подключиться к серверу SQL в течение, казалось бы, случайных периодов времени в 15 минут. Через 15 минут проблема решается сама собой, и сайт снова запускается.
Сообщение об ошибке:
Exception: System.Data.SqlClient.SqlException
Message: 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)
Source: .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)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
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, 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 Sitecore.Data.DataProviders.Sql.DataProviderCommand..ctor(IDbCommand command, DataProviderTransaction transaction, Boolean openConnection)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.<>c__DisplayClass4.<CreateCommand>b__3()
at Sitecore.Data.DataProviders.NullRetryer.Execute[T](Func`1 action, Action recover)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.<>c__DisplayClass12.<CreateReader>b__10()
at Sitecore.Data.DataProviders.NullRetryer.Execute[T](Func`1 action, Action recover)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.CreateReader(String sql, Object[] parameters)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.<CreateObjectReader>d__6`1.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at Sitecore.Eventing.EventQueue.ProcessEvents(Action`2 handler)
at Sitecore.Eventing.EventProvider.RaiseQueuedEvents()
Nested Exception
Exception: System.ComponentModel.Win32Exception
Message: The network path was not found
6420 16:53:53 ERROR Exception processing remote events from database: web
Exception: System.Data.SqlClient.SqlException
Message: 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)
Source: .Net SqlClient Data Provider
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 Sitecore.Data.DataProviders.Sql.DataProviderCommand..ctor(IDbCommand command, DataProviderTransaction transaction, Boolean openConnection)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.<>c__DisplayClass4.<CreateCommand>b__3()
at Sitecore.Data.DataProviders.NullRetryer.Execute[T](Func`1 action, Action recover)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.<>c__DisplayClass12.<CreateReader>b__10()
at Sitecore.Data.DataProviders.NullRetryer.Execute[T](Func`1 action, Action recover)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.CreateReader(String sql, Object[] parameters)
at Sitecore.Data.DataProviders.Sql.SqlDataApi.<CreateObjectReader>d__6`1.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at Sitecore.Eventing.EventQueue.ProcessEvents(Action`2 handler)
at Sitecore.Eventing.EventProvider.RaiseQueuedEvents()
Nested Exception
Exception: System.ComponentModel.Win32Exception
Message: The network path was not found
Это сообщение об ошибке похоже на ту же ошибку, которую вы получили бы, если бы у вас была опечатка в строке подключения, но сайт работает нормально в 99% случаев.
Если бы сообщение об ошибке было тайм-аутом, я мог бы предположить, что причина в том, что приложение вызывает чрезмерную нагрузку, и SQL не может ответить, однако журналы SQL RDS не показывают большой нагрузки, а просто обрывают соединения в течение 15 минут.
Есть ли что-нибудь с точки зрения приложения/кода, что может вызвать это?
Имеет ли значение период в 15 минут? Это намек на что-то конкретное?
Это закончилось проблемой с настройками проблемы с записью DNS. Не уверен в деталях, так как наша команда платформы исправила ошибку.