# rpc error: code = Unavailable desc = all SubConns are in TransientFailure

- **ID:** `go/grpc-server-reflect-unavailable`
- **Domain:** go
- **Category:** network_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

gRPC server reflection is enabled but the server is not reachable due to network partition or server crash.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.2 | active | — | — |

## Workarounds

1. **Check server health endpoint and restart if needed.** (90% success)
   ```
   grpcurl -plaintext localhost:50051 list
   ```
2. **Verify firewall rules allow gRPC traffic on the target port.** (85% success)
   ```
   nc -zv server-address 50051
   ```

## Dead Ends

- **Increase client timeout to 10 seconds.** — The server is not responding at all, timeout won't help. (95% fail)
- **Add retry logic with exponential backoff.** — Retries won't fix a dead server. (90% fail)