C#•2y ago

✅ Failed to bind to address http://127.0.0.1:5196: address already in use

Hi firends, I'm working on a project using Microservices, I use RabbitMQ as the message broker, and the MassTransit as the abstraction layer over the RabbitMQ. I have a service called AuthService which uses the RabbitMQ, another service called ExpenseService.API also uses the same RabbitMQ in appsettings.json of both services/projects have the same follwing RabbitMQ options

"RabbitMQ": {
    "Settings": {
      "HostName": "rabbitmq://localhost",
      "UserName": "guest",
      "Password": "guest"
    },

    "Endpoints": {
      "AuthService": {
        "UserCreatedEventQueue": "AuthService-UserCreatedEventQueue"
      }
    }
  }

"RabbitMQ": {
    "Settings": {
      "HostName": "rabbitmq://localhost",
      "UserName": "guest",
      "Password": "guest"
    },

    "Endpoints": {
      "AuthService": {
        "UserCreatedEventQueue": "AuthService-UserCreatedEventQueue"
      }
    }
  }

in the program.cs of ExpenseService.API I have this part which configure the project to be a consumer/subscriber :

var authServiceRabbitMqEndPointsOptions = builder.Configuration.GetSection("RabbitMQ:EndPoints:AuthService").Get<AuthServiceRabbitMqEndpointsOptions>();
var authServiceRabbitMqEndPoints = authServiceRabbitMqEndPointsOptions;


builder.Services.AddMassTransit( busConfigurator => 
{
    busConfigurator.UsingRabbitMq((context, cfg) => 
    {
        cfg.ReceiveEndpoint(authServiceRabbitMqEndPoints.UserCreatedEventQueue, ep => ep.Consumer<UserCreatedMessageConsumer>());
    });
});

var authServiceRabbitMqEndPointsOptions = builder.Configuration.GetSection("RabbitMQ:EndPoints:AuthService").Get<AuthServiceRabbitMqEndpointsOptions>();
var authServiceRabbitMqEndPoints = authServiceRabbitMqEndPointsOptions;


builder.Services.AddMassTransit( busConfigurator => 
{
    busConfigurator.UsingRabbitMq((context, cfg) => 
    {
        cfg.ReceiveEndpoint(authServiceRabbitMqEndPoints.UserCreatedEventQueue, ep => ep.Consumer<UserCreatedMessageConsumer>());
    });
});

When I start AuthService then ExpenseService I get this exception :

Exception has occurred: CLR/System.IO.IOException An unhandled exception of type 'System.IO.IOException' occurred in System.Private.CoreLib.dll: 'Failed to bind to address http://127.0.0.1:5196: address already in use.' Inner exceptions found, see $exception in variables window for more details. Innermost exception System.Net.Sockets.SocketException : Only one usage of each socket address (protocol/network address/port) is normally permitted.

Please I hope someone to provide a help here and massive thanks in advance

10 Replies

Pobiega•2y ago

You have two or more listeners on the same port. Its as easy as that.

M B V R KOP•2y ago

listeners means apps ?

Pobiega•2y ago

could be. are your microservices using http listeners? in that case, yes check the logs of each service asp.net prints the port its listening on in each service

M B V R KOP•2y ago

Yeah the AuthService is running on http://localhost:5196/ and when I start the ExpenseService I get the exception I mentionned

Pobiega•2y ago

right so they are trying to listen on the same port thats a no-go, so you need to change the launch settings for one of them

Unknown User•2y ago

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Pobiega•2y ago

very cool powershell script, wont help here thou 😄

M B V R KOP•2y ago

hmmm, you mean exactly the port ?

Unknown User•2y ago

Message Not Public

M B V R KOP•2y ago

@TeBeClone Yeah, very clear, I really appreciate your help and time man

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✅ Failed to bind to address http://127.0.0.1:5196: address already in use

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