deepseek-ai/deepseek-harness · error

[web-runtime] connection lost, retry #${this.attempt}

Error message

[web-runtime] connection lost, retry #${this.attempt}

What it means

Error "[web-runtime] connection lost, retry #${this.attempt}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/client/connection/src/client/connection.ts:165

        }
        if (ac.signal.aborted) throw new Error('generation aborted during readiness handshake')
        this.attempt = 0
        this.emitState('connected')
        // A state sink may synchronously stop this controller. Do not publish
        // a description for a generation that no longer exists afterward.
        if (this.isGenerationActive(ac)) {
          this.callSink(() => { this.sinks.onConnected?.(descriptionResult.value) })
        }
      } catch {
        // Transport failure: treat as generation failure, fall through to the shared backoff.
        if (!ac.signal.aborted) ac.abort()
      }

      await failed
      if (!this.isRunning()) return
      this.emitState('reconnecting')
      this.attempt += 1
      console.warn(`[web-runtime] connection lost, retry #${this.attempt}`)
      const idle = new AbortController()
      await sleep(this.backoffDelay(this.attempt), idle.signal)
    }
  }

  /** Deduplicated state emission (sink isolation applies). */
  private emitState(state: ConnectionState): void {
    if (this.lastState === state) return
    this.lastState = state
    this.callSink(() => this.sinks.onStateChange?.(state))
  }

  private async pumpStream<F extends { type: string }>(
    stream: AsyncIterable<RpcRequest<F>>,
    sink: ((envelope: RpcRequest<F>) => void) | undefined,
    onEnd: () => void,
  ): Promise<void> {
    try {

View on GitHub (pinned to b150a551b8)

Solutions

1. Check network connectivity and that the server is reachable; restart the client if retries exhaust.

When it happens

Trigger: Thrown at packages/client/connection/src/client/connection.ts:165 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/e57474a0a33dd1e9. Report an issue: GitHub.