错误异常信息如下:

org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Cannot connect to a Redis Sentinel: [redis://124.220.28.236:26379?timeout=30000000ns, redis://124.220.28.236:26380?timeout=30000000ns, redis://124.220.28.236:26381?timeout=30000000ns]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1689)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1597)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1383)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getConnection(LettuceConnectionFactory.java:1366)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getSharedReactiveConnection(LettuceConnectionFactory.java:1117)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getReactiveConnection(LettuceConnectionFactory.java:509)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getReactiveConnection(LettuceConnectionFactory.java:103)
	at reactor.core.publisher.MonoSupplier.call(MonoSupplier.java:86)
	at reactor.core.publisher.FluxSubscribeOnCallable$CallableSubscribeOnSubscription.run(FluxSubscribeOnCallable.java:227)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: io.lettuce.core.RedisConnectionException: Cannot connect to a Redis Sentinel: [redis://124.220.28.236:26379?timeout=30000000ns, redis://124.220.28.236:26380?timeout=30000000ns, redis://124.220.28.236:26381?timeout=30000000ns]
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:72)
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56)
	at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:330)
	at io.lettuce.core.RedisClient.connect(RedisClient.java:216)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:115)
	at java.util.Optional.orElseGet(Optional.java:267)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:115)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1595)
	... 15 common frames omitted
Caused by: io.lettuce.core.RedisConnectionException: Cannot connect Redis Sentinel at redis://124.220.28.236:26381?timeout=30000000ns
	at io.lettuce.core.RedisClient.lambda$connectSentinelAsync$6(RedisClient.java:527)
	at reactor.core.publisher.Mono.lambda$onErrorMap$31(Mono.java:3733)
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:94)
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:106)
	at reactor.core.publisher.Operators.error(Operators.java:198)
	at reactor.core.publisher.MonoError.subscribe(MonoError.java:53)
	at reactor.core.publisher.Mono.subscribe(Mono.java:4400)
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:103)
	at reactor.core.publisher.MonoCompletionStage.lambda$subscribe$0(MonoCompletionStage.java:77)
	at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
	at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
	at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
	at io.lettuce.core.AbstractRedisClient.lambda$initializeChannelAsync0$6(AbstractRedisClient.java:424)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616)
	at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609)
	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117)
	at io.netty.channel.nio.AbstractNioChannel.doClose(AbstractNioChannel.java:502)
	at io.netty.channel.socket.nio.NioSocketChannel.doClose(NioSocketChannel.java:349)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.doClose0(AbstractChannel.java:754)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:731)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:620)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.close(DefaultChannelPipeline.java:1352)
	at io.netty.channel.AbstractChannelHandlerContext.invokeClose(AbstractChannelHandlerContext.java:622)
	at io.netty.channel.AbstractChannelHandlerContext.access$1200(AbstractChannelHandlerContext.java:61)
	at io.netty.channel.AbstractChannelHandlerContext$11.run(AbstractChannelHandlerContext.java:611)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	... 1 common frames omitted
Caused by: java.nio.channels.ClosedChannelException: null
	... 17 common frames omitted

我将redis配置信息中的timeout移除，就可以正常连接了: