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API:127.0.01:8844/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection ref
ERROR [com.alibaba.nacos.client.naming:454] - [uuid=] [token=] - request 127.0.0.1:8844 failed. ErrCode:500, ErrMsg:failed to req API:127.0.01:8844/nacos/v1/ns/instance/beat. code:500 msg: java.net.ConnectException: Connection refused 遇到这种错误有 以下几种