错误提示，如下：

13:46:52.177 [main] ERROR c.a.n.c.r.c.g.GrpcClient - [printIfErrorEnabled,99] - Server check fail, please check server 192.168.2.154 ,port 9848 is available , error ={}
java.util.concurrent.ExecutionException: com.alibaba.nacos.shaded.io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
	at com.alibaba.nacos.shaded.com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:566)
	at com.alibaba.nacos.shaded.com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:445)
	at com.alibaba.nacos.common.remote.client.grpc.GrpcClient.serverCheck(GrpcClient.java:146)
	at com.alibaba.nacos.common.remote.client.grpc.GrpcClient.connectToServer(GrpcClient.java:268)
	at com.alibaba.nacos.common.remote.client.RpcClient.start(RpcClient.java:395)
	at com.alibaba.nacos.client.config.impl.ClientWorker$ConfigRpcTransportClient.ensureRpcClient(ClientWorker.java:924)
	at com.alibaba.nacos.client.config.impl.ClientWorker$ConfigRpcTransportClient.getOneRunningClient(ClientWorker.java:1087)
	at com.alibaba.nacos.client.config.impl.ClientWorker$ConfigRpcTransportClient.queryConfig(ClientWorker.java:979)
	at com.alibaba.nacos.client.config.impl.ClientWorker.getServerConfig(ClientWorker.java:407)
	at com.alibaba.nacos.client.config.NacosConfigService.getConfigInner(NacosConfigService.java:166)
	at com.alibaba.nacos.client.config.NacosConfigService.getConfig(NacosConfigService.java:94)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.loadNacosData(NacosPropertySourceBuilder.java:85)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.build(NacosPropertySourceBuilder.java:73)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosPropertySource(NacosPropertySourceLocator.java:199)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosDataIfPresent(NacosPropertySourceLocator.java:186)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadNacosConfiguration(NacosPropertySourceLocator.java:158)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.loadSharedConfiguration(NacosPropertySourceLocator.java:116)
	at com.alibaba.cloud.nacos.client.NacosPropertySourceLocator.locate(NacosPropertySourceLocator.java:101)

针对nacos 2.0版本

nacos 的默认端口是 8848，也是之前 HTTP 协议对接时的请求端口，那么我们是不是通过 8848 这个端口进行 gRPC 的交互呢？

答案是否定的！

nacos 里面做了一个约定，把 gRPC 的服务端口设置成 nacos 启动的端口加 1000。

也就是说，nacos 的端口是 8848 的话，那么 gRPC 服务端口就是 9848

所以这里是第一个注意的点。