我无法将字符串值存储到azure托管的redis缓存中。使用stackexchange.redis版本2.0.601以及vs2015和vs2019。下面的代码在注解中有错误（基本上即使是成功的connectionmultiplexer.connect也没有建立连接）。

static bool Connect()
    {           
        ConnectionMultiplexer redis; 

        try
        {
            ConfigurationOptions cfgOptions = new ConfigurationOptions
            {
                EndPoints =
                {
                    {"RedisOnMyAzureServer", myPort}
                },
                AbortOnConnectFail = false,
                Ssl = true,
                ConnectRetry = 3,
                ConnectTimeout = 10000,
                SyncTimeout = 10000,
                DefaultDatabase = 0,
                Password = "myPassword"
            };
            redis = ConnectionMultiplexer.Connect(cfgOptions);   // takes 10.5 seconds on average 
        }
        catch
        { return false; }  // never errors

        // some diagnostics follow

        if (redis.IsConnected) 
            Console.WriteLine("client connection open"); 
        else
            Console.WriteLine("client connection closed");

        if (redis.GetDatabase().IsConnected(default(RedisKey))) 
            Console.WriteLine("database connection open"); 
        else 
            Console.WriteLine("database connection closed");

        // both connection are always closed.

        try
        {
            IDatabase db = redis.GetDatabase();
            db.StringSet("mykey", "value");
        }
        catch
        { return false; }  // always errors 

        return true;
    }

db.stringset方法上的最后一次try/catch时出错。我得到这个信息：
没有可用于服务此操作的连接：set mykey；阻塞操作被wsacancelblockingcall调用中断；iocp:（忙=0，空闲=1000，最小=4，最大=1000），工作线程：（忙=2，空闲=1021，最小=4，最大=1023），本地cpu:n/a