grpc network_error ai_generated true

UNAVAILABLE: grpc: connection refused to backend service at 10.0.0.1:8080

ID: grpc/client-connection-refused

Also available as: JSON · Markdown · 中文
85%Fix Rate
85%Confidence
1Evidence
2024-01-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
gRPC v1.48.0 active — — —
gRPC v1.54.0 active — — —
gRPC v1.60.0 active — — —
Envoy 1.26.0 active — — —

Root Cause

The gRPC client's attempt to connect to the backend service was refused because the service is not listening on the specified port or the port is blocked by a firewall.

generic

中文

gRPC 客户端尝试连接到后端服务的请求被拒绝，因为服务未在指定端口上监听或端口被防火墙阻止。

Official Documentation

https://grpc.io/docs/guides/error/

Workarounds

  1. 80% success Verify that the backend service is running and listening on the expected port: `netstat -tulpn | grep 8080` on the server. 
    Verify that the backend service is running and listening on the expected port: `netstat -tulpn | grep 8080` on the server.
  2. 85% success Check firewall rules to ensure the port is open: `sudo ufw status` or `iptables -L -n` and add a rule if needed: `sudo ufw allow 8080/tcp`. 
    Check firewall rules to ensure the port is open: `sudo ufw status` or `iptables -L -n` and add a rule if needed: `sudo ufw allow 8080/tcp`.
  3. 90% success Update the client's target URI to use a correct host or port if misconfigured, e.g., change from '10.0.0.1:8080' to '10.0.0.1:9090'. 
    Update the client's target URI to use a correct host or port if misconfigured, e.g., change from '10.0.0.1:8080' to '10.0.0.1:9090'.

中文步骤

  1. 验证后端服务是否正在运行并在预期端口上监听：在服务器上运行 `netstat -tulpn | grep 8080`。
  2. 检查防火墙规则以确保端口已开放：运行 `sudo ufw status` 或 `iptables -L -n`，如有需要添加规则：`sudo ufw allow 8080/tcp`。
  3. 更新客户端的目标 URI 以使用正确的主机或端口（如果配置错误），例如将 '10.0.0.1:8080' 更改为 '10.0.0.1:9090'。

Dead Ends

Common approaches that don't work:

  1. 60% fail

    Restarting the client application without checking the backend service status does not resolve the connection refusal.

  2. 50% fail

    Increasing gRPC retry intervals in the client config may delay the error but does not fix the underlying service unavailability.

  3. 70% fail

    Clearing the local DNS cache does not help because the error indicates a TCP connection refusal, not a resolution failure.