CODEWITHSUNDEEP
azurestackexchange.redisazure-redis-cache
Sam
Sam

Reputation: 559

Azure Redis Cache error No connection is available to service this operation:

I'm trying to use Azure Redis cache in my MVC 4.6 app but getting connection errors. This is the error:

No connection is available to service this operation: GET c7fc43f3-47c4-43cb-94ff-50527b1cda0c_TokenCache; It was not possible to connect to the redis server(s); to create a disconnected multiplexer, disable AbortOnConnectFail. ConnectTimeout; IOCP: (Busy=3,Free=997,Min=2,Max=1000), WORKER: (Busy=2,Free=4093,Min=2,Max=4095), Local-CPU: 100%

My web.config has:

<add key="ida:CacheConnection" value="myCache.redis.cache.windows.net:6380,password=bpPQX6jeocNjyX1FqrvVztGMQqjekXbUXFjGkiZOyCE=,ssl=True,abortConnect=False,connectTimeout=30,syncTimeout=3000,ConnectRetry=3" />

My packages.config has: 

<package id="StackExchange.Redis" version="1.2.0" targetFramework="net45" />

I followed this MSDN article to configure Aazure Redis server and client.

I tried to use client side cmd line tool to verify the connection even that is not working. Not giving me any sign of success or failure. This is my command:

C:\Program Files\Redis>redis-cli -h "myCache.redis.cache.windows.net" -a bpPQX= -p 6379

I tried -p 6380 as well but nothing changed.

Upvotes: 3

Views: 5796

Answers (4)

Sanju Kushwaha
Sanju Kushwaha

Reputation: 61

  1. Update your connection string

    • Set abortConnect to false
    • Adjust your syncTimeout and asyncTimeout as needed.
    • If you are using a secure TLS connection set the ssl=True,sslprotocols=tls12 in your configuration to force it to the latest version.

  2. Upgrade your StackExchange.Redis nuget package to latest if you can.

  3. Set the config option for ReconnectRetryPolicy in your C# code to be ExponentialRetry https://stackexchange.github.io/StackExchange.Redis/Configuration.html#reconnectretrypolicy

    private static readonly Lazy<ConfigurationOptions> configOptions  = new Lazy<ConfigurationOptions>(() =>
{
    var connections = ConfigurationManager.ConnectionStrings["redis-connection"].ConnectionString;
    var configOptions = ConfigurationOptions.Parse(connections);

    configOptions.ClientName = "MyApp-RedisCacheProvider";
    //configOptions.SyncTimeout = 100000; // don`t do this in code, set it in your connection string
    //configOptions.AbortOnConnectFail = false; // don`t do this in code, set it in your connection string

    /*
     * The default is LinearRetry which can cause congestion at virtually the same time on multiple parallel threads.
     * Use ExponentialRetry so that a degree of randomness is used in the timing across multiple threads.
     */
    configOptions.ReconnectRetryPolicy = new ExponentialRetry(5000, 10000);

    return configOptions;
});

 private static readonly Lazy<ConnectionMultiplexer> connection = new Lazy<ConnectionMultiplexer>(
         () => ConnectionMultiplexer.Connect(configOptions.Value));

  4. Implement IDisposable to dispose the object after its use

         public void Dispose()
     {
         try {
             if (connection.IsValueCreated)
             {
                 connection.Value.Dispose(); 
             }
         } catch { }
     }

Upvotes: 0

John J Smith
John J Smith

Reputation: 11913

I had this same problem but in my case it was because a private endpoint had been setup on the Redis instance and this blocks all non-local connections. Check if you have a private endpoint setup.

Upvotes: 0

juvchan
juvchan

Reputation: 6245

You should go to your Redis Cache resource blade's Advanced Settings in the Azure portal, set Allow access only via SSL to No and Save the setting.

You should be able to connect to your Redis cache via Redis CLI:

redis-cli -h "myCache.redis.cache.windows.net" -a bpPQX=

-p 6379 can be optional because the default Non-SSL port for Azure Redis Cache is 6379.

enter image description here

Reference: StackExchange.Redis Configuration Doc

Upvotes: 0

Sparrow_ua
Sparrow_ua

Reputation: 704

Set in Azure Portal: Non-SSL port (6379) enabled.

Try to connect to port 6379, using CLI. I don't think that Redis-CLI can connect to SSL port (6380)

Upvotes: 1

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