C#•3y 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

RabbitMQ

as the message broker, and the

MassTransit

MassTransit

as the abstraction layer over the

RabbitMQ

RabbitMQ

.
I have a service called AuthService which uses the

RabbitMQ

RabbitMQ

, another service called

ExpenseService.API

ExpenseService.API

also uses the same

RabbitMQ

RabbitMQ

appsettings.json

appsettings.json

of both services/projects have the same follwing

RabbitMQ

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

program.cs

ExpenseService.API

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

AuthService

then

ExpenseService

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

Pobiega•8/17/23, 6:01 PM

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

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

M B V R KOP•8/17/23, 6:02 PM

listeners means apps ?

Pobiega•8/17/23, 6:02 PM

could be.

Pobiega•8/17/23, 6:02 PM

are your microservices using http listeners? in that case, yes

Pobiega•8/17/23, 6:02 PM

check the logs of each service

Pobiega•8/17/23, 6:03 PM

asp.net prints the port its listening on in each service

PPobiega asp.net prints the port its listening on in each service

M B V R KOP•8/17/23, 6:08 PM

Yeah the

AuthService

AuthService

is running on and when I start the

ExpenseService

ExpenseService

I get the exception I mentionned

Pobiega•8/17/23, 6:08 PM

right

Pobiega•8/17/23, 6:08 PM

so they are trying to listen on the same port

Pobiega•8/17/23, 6:09 PM

thats a no-go, so you need to change the launch settings for one of them

MM B V R K listeners means apps ?

TeBeCo•8/17/23, 6:09 PM

Pobiega•8/17/23, 6:09 PM

very cool powershell script, wont help here thou

PPobiega thats a no-go, so you need to change the launch settings for one of them

M B V R KOP•8/17/23, 6:10 PM

hmmm, you mean exactly the port ?

TeBeCo•8/17/23, 6:10 PM

ok ok let me do an attempt jere

TeBeCo•8/17/23, 6:10 PM

an IP address is like your postal adress

TeBeCo•8/17/23, 6:10 PM

and the PORT is the NUMBER

TeBeCo•8/17/23, 6:10 PM

imagine you live in a building

TeBeCo•8/17/23, 6:11 PM

how many familly can use the same NUMBER in that SAME building ?

TeBeCo•8/17/23, 6:11 PM

the Appartment number I mean

TeBeCo•8/17/23, 6:11 PM

you can't put 2 familly on the same number

TeBeCo•8/17/23, 6:11 PM

even though they are all on

TeBeCo•8/17/23, 6:11 PM

one is and the other

TeBeCo•8/17/23, 6:12 PM

this is done so taht when I send you a letter I HAVE TO SPECIIFY or

TeBeCo•8/17/23, 6:12 PM

that's the same for network

TeBeCo•8/17/23, 6:12 PM

Address + Port nubmer

TeBeCo•8/17/23, 6:12 PM

when you boot your computer => 0 Port in use

TeBeCo•8/17/23, 6:12 PM

some app starts ...

TeBeCo•8/17/23, 6:12 PM

if they try to get that port

TeBeCo•8/17/23, 6:12 PM

port 5196 ....

TeBeCo•8/17/23, 6:13 PM

if no one tried to "claim it" they can use it

TeBeCo•8/17/23, 6:13 PM

but the next app trying to use it won't be able to until the first app release it

TeBeCo•8/17/23, 6:13 PM

which is how WebServer or messaging stuff works

TeBeCo•8/17/23, 6:13 PM

a site running on port 80 just mean that a process claim and asked to listen on port 80

TeBeCo•8/17/23, 6:14 PM

you won't be able to run another app on port 80 on that same address

TeBeCo•8/17/23, 6:14 PM

i have no clue if that helped

TeBeCo•8/17/23, 6:14 PM

i hope it did

M B V R KOP•8/18/23, 10:37 AM

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