Azure Redis 缓存 StackExchange.Redis.RedisConnectionException：没有可用于服务此操作的连接：EVAL

Question

Asp.net mvc 5 应用程序网络配置文件是

   sessionState mode="Custom" customProvider="RedisSessionProvider">
      providers>
add name="RedisSessionProvider" type="Microsoft.Web.Redis.RedisSessionStateProvider" port="6380" host="XXX.redis.cache.windows.net" accessKey="XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" ssl="true" />
 providers>
    sessionState>

当我运行应用程序出错时

Server Error in '/' Application.
No connection is available to service this operation: EVAL
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: StackExchange.Redis.RedisConnectionException: No connection is available to service this operation: EVAL
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[RedisConnectionException: No connection is available to service this operation: EVAL]
   StackExchange.Redis.ConnectionMultiplexer.ExecuteSyncImpl(Message message, ResultProcessor`1 processor, ServerEndPoint server) in c:\TeamCity\buildAgent\workae0647004edff78\StackExchange.Redis\StackExchange\Redis\ConnectionMultiplexer.cs:1922
   StackExchange.Redis.RedisBase.ExecuteSync(Message message, ResultProcessor`1 processor, ServerEndPoint server) in c:\TeamCity\buildAgent\workae0647004edff78\StackExchange.Redis\StackExchange\Redis\RedisBase.cs:80
   StackExchange.Redis.RedisDatabase.ScriptEvaluate(String script, RedisKey[] keys, RedisValue[] values, CommandFlags flags) in c:\TeamCity\buildAgent\workae0647004edff78\StackExchange.Redis\StackExchange\Redis\RedisDatabase.cs:866
   Microsoft.Web.Redis.<>c__DisplayClass4.<Eval>b__3() in c:\TeamCity\buildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:113
   Microsoft.Web.Redis.StackExchangeClientConnection.RetryForScriptNotFound(Func`1 redisOperation) in c:\TeamCity\buildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:129
   Microsoft.Web.Redis.StackExchangeClientConnection.RetryLogic(Func`1 redisOperation) in c:\TeamCity\buildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:155
   Microsoft.Web.Redis.StackExchangeClientConnection.Eval(String script, String[] keyArgs, Object[] valueArgs) in c:\TeamCity\buildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:113
   Microsoft.Web.Redis.RedisConnectionWrapper.Set(ISessionStateItemCollection data, Int32 sessionTimeout) in c:\TeamCity\buildAgent\work\f55792526e6d9089\src\RedisSessionStateProvider\RedisConnectionWrapper.cs:135
   Microsoft.Web.Redis.RedisSessionStateProvider.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) in c:\TeamCity\buildAgent\work\f55792526e6d9089\src\RedisSessionStateProvider\RedisSessionStateProvider.cs:408
   System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +906
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +142
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +92
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1055.0

Answer 1

可能有 3 个原因：

您的连接字符串错误（无论如何看起来都不错）
实例尚未创建（在 azure 中创建通常需要很多时间）
您面临防火墙（包括 windows 防火墙）问题

您可以使用命令提示符连接到 redis 缓存实例吗？

下载redis for windows Here

然后是运行

redis-cli -h XXX.redis.cache.windows.net -a XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX

您可以在此处找到详细的演示（西班牙语，但控制台演示仍然可用。）

NinjaTip #18 - Introducción a Redis

出于测试目的，确保 Redis 服务打开了端口 6379（这是您需要在 Azure 上启用的非 SSl 端口选项）

如果您无法连接到您的实例，是因为上面列出的某些原因。

Answer 2

我之前遇到过同样的问题，我找到了使用另一个解决方案的解决方案： https://github.com/alex-simonov/RedisAspNetProviders

这个适合我

Answer 3

我发现网络配置中只有以下配置对我有用：

<sessionState mode="Custom" customProvider="MySessionStateStore">
  <providers>
    <add name="MySessionStateStore" type="Microsoft.Web.Redis.RedisSessionStateProvider" connectionString="PUTCORRECTNAMEHERE.edis.cache.windows.net:6380,password=YOURPRIMARYKEYPUTHERE,ssl=True,abortConnect=False" />
  </providers>
</sessionState>

Answer 4

我也有同样的情况，并最终通过将 sslprotocols=tls12 添加到连接字符串来修复它。它应该不是必需的，但显然是必需的，使用最近在 Azure 上创建的 Redis 缓存。可能是由于弃用了 TLS 1.0 和 1.2

Azure Redis 缓存 StackExchange.Redis.RedisConnectionException：没有可用于服务此操作的连接：EVAL

Azure Redis Cache StackExchange.Redis.RedisConnectionException: No connection is available to service this operation: EVAL

caching

azure

redis

azure-caching

azure-redis-cache

NinjaTip #18 - Introducción a Redis