Ocelot gateway unable to obtain configuration from identityserver in docker compose - asp.net-core

Question

I have an error that I can't seem to understand why this is happening.
I have a microservice architecture running in a docker network. I'm trying to set up an identity server with the framework Identityserver4.
There is a proxy forwarding to an Ocelot gateway. The client is an angular application.
The login and logout and retrieving the access token and the identity token is successful, but when I try to set up authentication in Ocelot, I get the following error.
DX20803: Unable to obtain configuration from: 'http://identityservice:5010/.well-
known/openid-configuration'.
gateway_1 | System.InvalidOperationException: IDX20803: Unable to obtain
configuration from: 'http://identityservice:5010/.well-known/openid-configuration'.
gateway_1 | ---> System.IO.IOException: IDX20804: Unable to retrieve document
from: 'http://localhost/auth/.well-known/openid-configuration/jwks'.
gateway_1 | ---> System.Net.Http.HttpRequestException: Cannot assign
requested address
The docker-compose is set up in this way
version: '3.0'
services:
pricecalendarservice:
build:
context: ./PriceCalendarService
environment:
- ASPNETCORE_URLS=http://+:5002
- RedisConnection=redis
gateway:
build:
context: ./Gateway/
environment:
- ASPNETCORE_URLS=http://+:5000
- ID_URL=http://identityservice
frontend:
build:
context: ./SPA
dockerfile: staging.dockerfile
itemmanagerservice:
build:
./ItemManagerService
environment:
- ASPNETCORE_URLS=http://+:5003
- IdentityUrl=http://identityservice
identityservice:
build:
context: ./IdentityServer/IdentityServer
environment:
- DEV_URL=http://localhost
- ASPNETCORE_ENVIRONMENT=Developmnet
- ASPNETCORE_URLS=http://+:5010
- IDENTITY_ISSUER=http://localhost/auth
- RedisConnection=redis
ports:
- 5010:5010
proxy:
build:
context: ./proxy
ports:
- 80:80
redis:
image: redis
ports:
- 6379:6379
The Identityserver is configured in the following way
string redisConnectionString = Environment.GetEnvironmentVariable("RedisConnection",
EnvironmentVariableTarget.Process);
string prodEnv = Environment.GetEnvironmentVariable("PROD_URL");
string devEnv = Environment.GetEnvironmentVariable("DEV_URL");
string env = Environment.GetEnvironmentVariable("ASPNETCORE_URLS");
string issuer = Environment.GetEnvironmentVariable("IDENTITY_ISSUER");
var redis = ConnectionMultiplexer.Connect( redisConnectionString + ":6379");
services.AddDataProtection()
.PersistKeysToStackExchangeRedis( redis , "DataProtection-Keys")
.SetApplicationName("product");
services.AddCors(o => o.AddPolicy("MyPolicy", builder =>
{
builder
.WithOrigins("https:localhost:4200")
.AllowAnyMethod()
.AllowAnyHeader();
}));
services.Configure<CookiePolicyOptions>(options =>
{
// This lambda determines whether user consent for non-essential cookies is
needed for a given request.
options.CheckConsentNeeded = context => true;
options.MinimumSameSitePolicy = SameSiteMode.None;
});
var config = new Config();
config.setEnvironemnt(devEnv);
services.AddIdentityServer(options => {
options.PublicOrigin = issuer;
})
.AddDeveloperSigningCredential()
.AddInMemoryIdentityResources(config.GetIdentityResources())
.AddInMemoryApiResources(config.GetApis())
.AddInMemoryClients(config.GetClients())
.AddTestUsers(config.GetUsers());
NB. the issuer is set to "http://localhost/auth"
The Nginx proxy server is set with the following settings
server {
listen 80;
location / {
proxy_pass http://frontend;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Host $server_name;
}
location /api/hub {
proxy_pass http://gateway:5000;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Host $server_name;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
location /api {
proxy_pass http://gateway:5000;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Host $server_name;
proxy_set_header Upgrade $http_upgrade;
proxy_cache_bypass $http_upgrade;
proxy_set_header Connection "upgrade";
}
location /auth {
proxy_pass http://gateway:5000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection keep-alive;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_cache_bypass $http_upgrade;
}
}
The gateway configuration is, as read in the documentation at Ocelot Documentation
var authenticationProviderKey = "TestKey";
s.AddAuthentication()
.AddIdentityServerAuthentication(authenticationProviderKey, x =>
{
x.Authority = "http://identityservice:5010";
x.RequireHttpsMetadata=false;
});
/*
options.TokenValidationParameters = new
Microsoft.IdentityModel.Tokens.TokenValidationParameters()
{
ValidAudiences = new[] {"item"}
};
*/
s.AddOcelot();
s.AddSwaggerGen(swagger =>
{
swagger.SwaggerDoc("v1", new OpenApiInfo { Title = "PriceCalendarService" });
});
It seems that the gateway, which is running inside the docker network cant get access to the identity server. But I have tried both the URL which the angular is calling which is
"http://localhost/auth"
And also the name of the service running in docker, in multiple ways.
"http://identityservice:5010"
"http://identityservice"
But somehow, the gateway can't get access to the identity server to load the discovery document.
Can anyone point me in any direction on how to get this right.