错误日志：Nacos 2.x Config 配置中心死活不读取配置

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* 注：版本：Nacos 2.x                      不一定全是这个问题，只是有可能

错误信息：无具体错误堆栈信息，只是不读取配置中心的配置(nacos所有配置都正确无误)，这里以数据库配置从配置中心读取为例

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-02-18 21:06:21 [main] ERROR o.s.b.diagnostics.LoggingFailureAnalysisReporter - 

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (the profiles develop are currently active).

2022-02-18 21:06:21 [Thread-2] WARN  com.alibaba.nacos.common.http.HttpClientBeanHolder - [HttpClientBeanHolder] Start destroying common HttpClient
2022-02-18 21:06:21 [Thread-7] WARN  com.alibaba.nacos.common.notify.NotifyCenter - [NotifyCenter] Start destroying Publisher
2022-02-18 21:06:21 [Thread-7] WARN  com.alibaba.nacos.common.notify.NotifyCenter - [NotifyCenter] Destruction of the end
2022-02-18 21:06:21 [Thread-2] WARN  com.alibaba.nacos.common.http.HttpClientBeanHolder - [HttpClientBeanHolder] Destruction of the end

错误原因：Nacos 2.0 版本新增了gRPC的通信方式，需要再开放两个端口，若nacos端口为8848，还需开放的端口为：【9848、9849】

官网地址：Nacos 2.0.0 兼容性文档

解决方案：开放这两个新增的端口

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