Unable to connect to the Redis server using Microsoft.AspNetCore.SignalR.StackExchangeRedis with .Net Aspire 13

Question

Unable to connect to the Redis server using Microsoft.AspNetCore.SignalR.StackExchangeRedis with .Net Aspire 13

Hoài Nam Nguyễn 61

I'm using .Net Aspire 13, .Net 10. I'm using the library package Include="Microsoft.AspNetCore.SignalR.StackExchangeRedis" Version="10.0.3". This is my AppHost:

var cache = builder.AddRedis("cache", 6379);

var presence = builder.AddProject<Projects.Chat_Presense>("chat-presense")    
    .WithReference(cache)
    .WaitFor(cache)
    .WithReference(keycloak)
    .WaitFor(keycloak)
    .WithEndpoint(port: 5001, targetPort: 6001, scheme: "http", name: "chat-presense", isExternal: true);

And in Projects.Chat_Presense, I configured Redis as follows:

builder.Services.AddSignalR().AddStackExchangeRedis("cache");

"ConnectionStrings": {
  "cache": "localhost:6379,password=FxxawDPpD1Tscj9pt2upxH,abortConnect=false"
}

but the error:

Microsoft.AspNetCore.SignalR.StackExchangeRedis.RedisHubLifetimeManager[14]

      Error connecting to Redis.

      StackExchange.Redis.RedisConnectionException: It was not possible to connect to the redis server(s). Error connecting right now. To allow this multiplexer to continue retrying until it's able to connect, use abortConnect=false in your connection string or AbortOnConnectFail=false; in your code.

         at StackExchange.Redis.ConnectionMultiplexer.ConnectImplAsync(ConfigurationOptions configuration, TextWriter writer, Nullable`1 serverType) in /_/src/StackExchange.Redis/ConnectionMultiplexer.cs:line 596

         at Microsoft.AspNetCore.SignalR.StackExchangeRedis.RedisOptions.ConnectAsync(TextWriter log)

         at Microsoft.AspNetCore.SignalR.StackExchangeRedis.RedisHubLifetimeManager`1.EnsureRedisServerConnection()

How do I fix this?

1 answer

Your answer

Answer 1

AddStackExchangeRedis expects either a full Redis connection string or a ConfigurationOptions object, not just the logical name of the connection string.

In the code, this line:

builder.Services.AddSignalR().AddStackExchangeRedis("cache");

passes the literal string "cache" to StackExchange.Redis, so it tries to connect to a server named cache on the default port, which fails.

Use the actual connection string instead, for example by reading it from configuration:

var redisConnectionString = builder.Configuration.GetConnectionString("cache");

builder.Services
    .AddSignalR()
    .AddStackExchangeRedis(redisConnectionString);

With the appsettings.json entry:

"ConnectionStrings": {
  "cache": "localhost:6379,password=FxxawDPpD1Tscj9pt2upxH,abortConnect=false"
}

Also ensure that the Redis server is actually running and reachable at localhost:6379 from the Chat_Presense project container/process. In containerized Aspire setups, localhost usually refers to the container itself, not the AppHost; use the service host name and port that Aspire assigns (for example, the resource name) in the connection string if needed.

References:

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Unable to connect to the Redis server using Microsoft.AspNetCore.SignalR.StackExchangeRedis with .Net Aspire 13

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Your answer