有没有遇到经常出现Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. 的问题

[km93522719]

022-09-02 09:34:09.795 +08:00 [302] [ERR]
System.Exception: 【主库】状态不可用，等待后台检查程序恢复方可使用。Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. This failure occurred while attempting to connect to the Principle server. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=7521; handshake=14987;
---> System.Exception: 【主库】状态不可用，等待后台检查程序恢复方可使用。Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. This failure occurred while attempting to connect to the Principle server. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=7521; handshake=14987;
at FreeSql.Internal.ObjectPool.ObjectPool1.getFree(Boolean checkAvailable) at FreeSql.Internal.ObjectPool.ObjectPool1.Get(Nullable1 timeout) at FreeSql.Internal.CommonProvider.AdoProvider.ExecuteReaderMultiple(Int32 multipleResult, DbConnection connection, DbTransaction transaction, Action2 fetchHandler, Action2 schemaHandler, CommandType cmdType, String cmdText, Int32 cmdTimeout, DbParameter[] cmdParms) --- End of inner exception stack trace --- at FreeSql.Internal.CommonProvider.AdoProvider.LoggerException(IObjectPool1 pool, PrepareCommandResult pc, Exception ex, DateTime dt, StringBuilder logtxt, Boolean isThrowException)
at FreeSql.Internal.CommonProvider.AdoProvider.ExecuteReaderMultiple(Int32 multipleResult, DbConnection connection, DbTransaction transaction, Action2 fetchHandler, Action2 schemaHandler, CommandType cmdType, String cmdText, Int32 cmdTimeout, DbParameter[] cmdParms)
at FreeSql.Internal.CommonProvider.AdoProvider.ExecuteReader(DbConnection connection, DbTransaction transaction, Action1 fetchHandler, CommandType cmdType, String cmdText, Int32 cmdTimeout, DbParameter[] cmdParms) at FreeSql.Internal.CommonProvider.Select0Provider2.ToListMrPrivate[TReturn](String sql, ReadAnonymousTypeAfInfo af, ReadAnonymousTypeOtherInfo[] otherData)
at FreeSql.Internal.CommonProvider.Select0Provider2.ToListMapReaderPrivate[TReturn](ReadAnonymousTypeAfInfo af, ReadAnonymousTypeOtherInfo[] otherData) at FreeSql.Internal.CommonProvider.Select0Provider2.ToListMapReader[TReturn](ReadAnonymousTypeAfInfo af)
at FreeSql.Internal.CommonProvider.Select0Provider2.InternalToList[TReturn](Expression select) at FreeSql.Internal.CommonProvider.Select1Provider1.ToList[TReturn](Expression`1 select)
at lambda_method419(Closure , Object , Object[] )
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Logged|12_1(ControllerActionInvoker invoker)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

[2881099]

运行环境描述一下

[km93522719]

站点 布署环境：阿里云ECS
操作系统：windows Server 2012
内存：32G

数据库布署环境：阿里云RDS
CPU：8核
内存：16G
数据库版本：SQL Server 2016

[luoyunchong]

TCP/IP 禁用了，要开放数据库的外网访问

[km93522719]

TCP/IP 禁用了，要开放数据库的外网访问

我们的系统都布署在阿里云ECS上，使用的是阿里云的经典网络，应用程序是可以进行访问的

[2881099]

直接使用 new SqlConnection(connectionString).Open() 测试