HelloZeroNet/ZeroNet · error · AnnounceError

No response after %.0fs

Error message

No response after %.0fs

What it means

In the same UDP announce flow, after tracker.connect() succeeded and announce() was sent, tracker.poll_once() is called to await the tracker's announce reply. If nothing comes back within the poll timeout, AnnounceError("No response after %.0fs") is raised with the elapsed time. The connection worked but the tracker never answered the announce request.

Solutions

  1. Increase the poll timeout if possible and retry the announce.
  2. Retry periodically — this plugin announces on a schedule, transient failures self-heal.
  3. Verify tracker supports the announce (num_want, info_hash) — some trackers ignore malformed ones.
  4. Fall back to other announce plugins (AnnounceTrackers/AnnounceLocal) for peer discovery.
  5. Check network stability/NAT keepalive settings.

Example fix

// before
back = tracker.poll_once()
if not back:
    raise AnnounceError("No response after %.0fs" % (time.time() - s))
// after
back = tracker.poll_once()
if not back:
    self.site.log.warning("No UDP announce response after %.0fs, will retry" % (time.time() - s))
    return []
Defensive patterns

Strategy: retry

Try / catch

try:
    peers = announce_plugin.announceTrackerUdp(tracker_address, file_info)
except AnnounceError as e:
    if "No response" in str(e):
        schedule_retry(tracker_address, delay=60)
    else:
        log.warning("Announce failed: %s" % e)

Prevention

When it happens

Trigger: UDP connect handshake succeeded but the announce request was dropped, the tracker is overloaded/rate-limiting, response larger than socket buffer, or the tracker silently ignores unknown info_hashes.

Common situations: Busy public trackers dropping announces under load; NAT timeouts between connect and announce; tracker that accepts connections but filters announces from unusual client ports; high-latency networks exceeding the poll timeout.

Related errors

AI-assisted analysis of HelloZeroNet/ZeroNet@454c0b2e7e (2026-09-02). Data as JSON: /api/errors/0d7c25918e7de3eb. Report an issue: GitHub.

Appendix: source

Thrown at plugins/AnnounceBitTorrent/AnnounceBitTorrentPlugin.py:65

        s = time.time()
        if config.disable_udp:
            raise AnnounceError("Udp disabled by config")
        if config.trackers_proxy != "disable":
            raise AnnounceError("Udp trackers not available with proxies")

        ip, port = tracker_address.split("/")[0].split(":")
        tracker = UdpTrackerClient(ip, int(port))
        if helper.getIpType(ip) in self.getOpenedServiceTypes():
            tracker.peer_port = self.fileserver_port
        else:
            tracker.peer_port = 0
        tracker.connect()
        if not tracker.poll_once():
            raise AnnounceError("Could not connect")
        tracker.announce(info_hash=self.site.address_sha1, num_want=num_want, left=431102370)
        back = tracker.poll_once()
        if not back:
            raise AnnounceError("No response after %.0fs" % (time.time() - s))
        elif type(back) is dict and "response" in back:
            peers = back["response"]["peers"]
        else:
            raise AnnounceError("Invalid response: %r" % back)

        return peers

    def httpRequest(self, url):
        headers = {
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11',
            'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
            'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3',
            'Accept-Encoding': 'none',
            'Accept-Language': 'en-US,en;q=0.8',
            'Connection': 'keep-alive'
        }

        req = urllib.request.Request(url, headers=headers)

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