Known Failure Modes
| Failure | Log Pattern | Cause | Recovery |
|---|---|---|---|
| SSH timeout | probe result X=ping-ok(socket:TimeoutError) |
SSH port open but server non-responsive | Use SMB or alternate IP |
| Connection refused | child exit code=255 |
SSH connection refused or lost | Retry with different target |
| No route | probe result X=error |
Host unreachable | Check network connectivity |