Microsoft Azure > Web App -- SQL 连接被远程主机强行关闭 -- 仅在空闲时间后的第一次调用时发生

Question

这是在连接到 SQL MI 实例时在 MS Azure 应用程序设置中发生的。流量流经 HCM。

相同的代码适用于 Web 应用程序直接查询 SQL 服务器 201 的本地设置。

"This issue is reproducible if we keep the application idle for a few minutes and retrigger any request which has database interaction"。一旦记录了以下错误，后续请求就可以正常工作。

记录了以下错误：

    Properties:
      SqlException.Errors = {
        "System.Data.SqlClient.SqlError: A connection was successfully established with the server, but then an error occurred during the pre-login handshake. 
(provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)",
      }
      SqlException.ClientConnectionId = "4560-9ca8-53ea0fdeca60"
      SqlException.Class = "20"
      SqlException.LineNumber = "0"
      SqlException.Number = "10054"
      SqlException.Procedure = ""
      SqlException.Server =""
      SqlException.State = "0"
      SqlException.Source = ".Net SqlClient Data Provider"
      SqlException.ErrorCode = "-2146232060"

    Data:
    HelpLink.ProdName = "Microsoft SQL Server"
    HelpLink.EvtSrc = "MSSQLServer"
    HelpLink.EvtID = "10054"
    HelpLink.BaseHelpUrl = "http://go.microsoft.com/fwlink"
    HelpLink.LinkId = "20476"
    MS_LoggedBy = "System.Collections.Generic.List`1[System.Object]"

    Stack Trace:
       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.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)

我已经尝试使用 Internet、MSDN 上提供的文档，

一个。我开始详细记录 HCM 的 System.Net 日志。但是在套接字级别没有发现问题。事件查看器中记录了以下异常

    HybridConnectionManager Trace: System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> 
System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
       at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
       at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)

b。考虑到它可能是 tcp 连接断开，我尝试使连接池 =False。

c。验证连接是否正在处理。代码写在Using块中，已定义disposed。

Answer 1

我已经解决了这个问题。这是由于连接断开。我们需要使用连接重试机制。一种。使用企业库瞬态错误块 b.定义重试策略 C。将 ado.net 连接从 SqlConnection 更改为 ReliableSqlConnection

Microsoft Azure > Web App -- SQL 连接被远程主机强行关闭 -- 仅在空闲时间后的第一次调用时发生

Microsoft Azure > Web App -- SQL Connection was forcibly closed by the remote host -- Happens only for the first call after idle time

c#

ado.net

connection-pooling

azure