{
  "id": "networking/ntp-stratum-too-high",
  "signature": "NTP: Server 203.0.113.1 stratum 16, too high to synchronize",
  "signature_zh": "NTP：服务器203.0.113.1层级16，过高无法同步",
  "regex": "stratum 16|stratum too high|NTP.*unsynchronized",
  "domain": "networking",
  "category": "protocol_error",
  "subcategory": null,
  "root_cause": "The NTP server reports a stratum value of 16, indicating it is unsynchronized or has lost its upstream reference clock, making it unusable as a time source.",
  "root_cause_type": "generic",
  "root_cause_zh": "NTP服务器报告层级值为16，表示它未同步或失去了上游参考时钟，使其无法用作时间源。",
  "versions": [
    {
      "version": "NTP 4.2.8",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "chrony 4.3",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "OpenNTPD 6.2",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Windows Time Service 10.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "The client NTP service is not the problem; the server's stratum is still 16, so the client will continue to reject it.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "This may cause the client to use a bad time source, leading to clock drift and potential synchronization issues.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Check the NTP server's upstream connection: on the server, run 'ntpq -p' to verify reachability and stratum of upstream servers, then fix network issues or reconfigure the server to use a reliable upstream",
      "success_rate": 0.85,
      "how": "Check the NTP server's upstream connection: on the server, run 'ntpq -p' to verify reachability and stratum of upstream servers, then fix network issues or reconfigure the server to use a reliable upstream",
      "condition": "",
      "sources": []
    },
    {
      "action": "Switch the client to a different NTP server with a lower stratum, e.g., replace 'server 203.0.113.1' with 'server pool.ntp.org iburst' in /etc/ntp.conf",
      "success_rate": 0.9,
      "how": "Switch the client to a different NTP server with a lower stratum, e.g., replace 'server 203.0.113.1' with 'server pool.ntp.org iburst' in /etc/ntp.conf",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Check the NTP server's upstream connection: on the server, run 'ntpq -p' to verify reachability and stratum of upstream servers, then fix network issues or reconfigure the server to use a reliable upstream",
    "Switch the client to a different NTP server with a lower stratum, e.g., replace 'server 203.0.113.1' with 'server pool.ntp.org iburst' in /etc/ntp.conf"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.ntp.org/documentation/",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.84,
  "fix_success_rate": 0.85,
  "resolvable": "partial",
  "first_seen": "2024-05-12",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}