泛化调用偶现超时

- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

## Ask your question here
dubbo版本：2.7.15
网关dubbo协议转换发现泛化调用偶现超时，最终原因是排查到一个提供方的服务由于网络问题未打通，导致一直调用超时失败，但是影响了整体的其他api调用，请问是啥原因？

报错数量是差不多每天调用1000w次请求，差不多会出现1w次超时，确实很奇怪为啥这个会有影响？？

以下是调用那个问题提供方的报错信息：
```less
org.apache.dubbo.rpc.RpcException: Failed to invoke the method queryAmountByCondition in the service org.apache.dubbo.rpc.service.GenericService. Tried 1 times of the providers [10.108.16.67:20991] (1/2) from the registry zk-tx.webuyops.com:2181 on the consumer 10.106.48.157 using the dubbo version 2.7.15. Last error is: Failed to invoke remote method: $invoke, provider: dubbo://10.108.16.67:20991/com.ynx.payment.platform.api.TaxRaiseApi?anyhost=true&application=soul_proxy&async=true&bean.name=ServiceBean:com.ynx.payment.platform.api.TaxRaiseApi&check=false&cluster=failfast&default.retries=0&default.timeout=3000&dubbo=2.0.2&generic=false&interface=com.ynx.payment.platform.api.TaxRaiseApi&loadbalance=roundrobin&metadata-type=remote&methods=queryBillList,queryAmountByCondition,queryBillListByCondition,queryAmount&pid=11&protocol=dubbo®ister.ip=10.106.48.157&release=2.7.3.5-JINGLING-RELEASE&remote.application=payment-platform-ynx&retries=0&serialization=json&side=consumer&sticky=false&threadpool=cached&timeout=3000×tamp=1680504781031, cause: client(url: dubbo://10.108.16.67:20991/com.ynx.payment.platform.api.TaxRaiseApi?anyhost=true&application=soul_proxy&async=true&bean.name=ServiceBean:com.ynx.payment.platform.api.TaxRaiseApi&check=false&cluster=failfast&codec=dubbo&default.retries=0&default.timeout=3000&dubbo=2.0.2&generic=false&heartbeat=60000&interface=com.ynx.payment.platform.api.TaxRaiseApi&loadbalance=roundrobin&metadata-type=remote&methods=queryBillList,queryAmountByCondition,queryBillListByCondition,queryAmount&pid=11&protocol=dubbo®ister.ip=10.106.48.157&release=2.7.3.5-JINGLING-RELEASE&remote.application=payment-platform-ynx&retries=0&serialization=json&side=consumer&sticky=false&threadpool=cached&timeout=3000×tamp=1680504781031) failed to connect to server /10.108.16.67:20991 client-side timeout 3000ms (elapsed: 3000ms) from netty client 10.106.48.157 using dubbo version 2.7.15
```

The report concerns generic invocation through Dubbo 2.7.15 and a Netty client timeout to provider 10.108.16.67:20991. Start by tracing the generic invocation and provider-selection paths, then examine the reported timeout, retry, cluster, and thread-pool settings. Done would require identifying why this unavailable provider affects other API calls and documenting or fixing the confirmed cause.

Written by the indexing model from the issue text.