Cannot access a disposed object.\nObject name: 'System.Net.Sockets.Socket

Hi Team, I am using EF core 3.1.19 to connect to AWS RDS MYSQL database. The packages used are below .

   <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.19" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.19" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="3.1.19" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="3.1.19" />
    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="3.2.7" />

and MYSQL Connector used is 0.69.10 version

I am getting the below exception intermittently while doing some db operation . The inner exception states that Cannot access a disposed object.\nObject name: 'System.Net.Sockets.Socket

I recently migrated from EF core 2.7 which was working fine there.

Exception Details

Message": "Connect Timeout expired.",
  "Source": "MySqlConnector",
  "StackTraceString": "   at MySqlConnector.Core.ServerSession.OpenTcpSocketAsync(ConnectionSettings cs, ILoadBalancer loadBalancer, IOBehavior ioBehavior, CancellationToken cancellationToken)\n   at MySqlConnector.Core.ServerSession.ConnectAsync(ConnectionSettings cs, Int32 startTickCount, ILoadBalancer loadBalancer, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/ServerSession.cs:line 368\n   at MySqlConnector.Core.ConnectionPool.GetSessionAsync(MySqlConnection connection, Int32 startTickCount, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/ConnectionPool.cs:line 143\n   at MySqlConnector.Core.ConnectionPool.GetSessionAsync(MySqlConnection connection, Int32 startTickCount, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/ConnectionPool.cs:line 143\n   at MySql.Data.MySqlClient.MySqlConnection.CreateSessionAsync(ConnectionPool pool, Int32 startTickCount, Nullable`1 ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Data.MySqlClient/MySqlConnection.cs:line 758",
  "RemoteStackTraceString": null,
  "RemoteStackIndex": 0,
  "HResult": -2147467259,
  "HelpURL": null
},
{
  "Depth": 4,
  "ClassName": "System.ObjectDisposedException",
  "Message": "Cannot access a disposed object.\nObject name: 'System.Net.Sockets.Socket'.",
  "Source": "System.Net.Sockets",
  "StackTraceString": "   at System.Net.Sockets.Socket.BeginConnect(IPAddress address, Int32 port, AsyncCallback requestCallback, Object state)\n   at System.Net.Sockets.TcpClient.BeginConnect(IPAddress address, Int32 port, AsyncCallback requestCallback, Object state)\n   at System.Threading.Tasks.TaskFactory`1.FromAsyncImpl[TArg1,TArg2](Func`5 beginMethod, Func`2 endFunction, Action`1 endAction, TArg1 arg1, TArg2 arg2, Object state, TaskCreationOptions creationOptions)\n   at System.Net.Sockets.TcpClient.ConnectAsync(IPAddress address, Int32 port)\n   at MySqlConnector.Core.ServerSession.OpenTcpSocketAsync(ConnectionSettings cs, ILoadBalancer loadBalancer, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/ServerSession.cs:line 907",

Further technical details

MySQL version: 5.7.33 Operating system: Linux 64 AWS ECS Pomelo.EntityFrameworkCore.MySql version:3.2.7 Microsoft.AspNetCore.App vesion: 3.1

Other details about my project setup: connection string Server=serverurl;Port=3306;Database=DBName;User=;Password=**;Allow User Variables=True;SslMode=Required

i am registering the DB context as InstancePerLifetimeScope.

Please help me on this.

[bgrainger]

FWIW the Inner Exception was removed in https://github.com/mysql-net/MySqlConnector/issues/1035 (>= 1.3.13) to avoid the confusing error message in the OP.

[PaulPBastian]

Was each of your in parallel running threads using their own DbContext instance?

Yes @lauxjpn , Each concurrent jobs will be running on separate thread and all db operation will happen under a lifetimescope instance created for each job like below

using (var childScope = _scope.BeginLifetimeScope())
{ 
  _logger.Debug("Executing job");
}

and dbcontext is resistered as

builder.Register({dbconext}).InstancePerLifetimeScope();

let me check the number of open connections