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Root cause analysis / Investigation

copilot.com

Reference RCA-1962E9B74A4EE9D8

Microsoft Chat website

Measurement point: Stealth NYC, 32 Avenue of the Americas.

Published investigation. Updates run automatically.

01 / Network path

Network path.

Endpoint measurements / ICMP IPv4

Latency over time.

Successful endpoint RTT recordings from up to one hour before and after the event. Points are sampled from the retained history.

Enter time range

Times use the selected timezone; choices include recorded samples and intervals across the available chart.

Use the recordings table below to view latency values.
Successful RTT recording Event interval

04 Nov 2026 22:15 – 05 Nov 2026 01:24 UTC. Hover or tap to inspect; drag across the chart to zoom. On touchscreens, first choose Select time range. Escape or Reset zoom restores the full range. Missing recordings are gaps; this is not an application availability or packet-loss chart.

Select a recording to explore nearby path observations.

View recorded values
Successful ICMP IPv4 RTT recordings; displayed points are a sample of the retained records.
Recorded at (UTC)RTT
6.726 ms
6.710 ms
6.719 ms
6.747 ms
6.775 ms
6.753 ms
6.725 ms
6.710 ms
6.630 ms
6.667 ms
6.645 ms
6.640 ms
6.631 ms
6.633 ms
6.643 ms
6.681 ms
6.643 ms
6.627 ms
6.655 ms
6.636 ms
6.665 ms
6.667 ms
6.643 ms
6.669 ms
6.633 ms
6.676 ms
6.636 ms
6.651 ms
6.670 ms
6.649 ms
6.669 ms
6.672 ms
6.661 ms
6.644 ms
6.633 ms
6.637 ms
6.631 ms
6.633 ms
6.658 ms
6.649 ms
6.653 ms
6.653 ms
6.680 ms
6.669 ms
6.661 ms
6.652 ms
6.693 ms
6.643 ms
6.708 ms
6.695 ms
6.745 ms
6.714 ms
6.752 ms
6.720 ms
6.655 ms
6.688 ms
6.692 ms
6.671 ms
6.660 ms
6.690 ms
6.648 ms
6.665 ms
6.692 ms
6.669 ms
6.666 ms
6.751 ms
6.686 ms
6.709 ms
6.669 ms
6.694 ms
6.657 ms
6.723 ms
6.691 ms
6.705 ms
6.677 ms
6.685 ms
6.714 ms
6.719 ms
6.633 ms
6.697 ms
6.673 ms
6.672 ms
6.641 ms
6.700 ms
6.653 ms
6.663 ms
6.664 ms
6.731 ms
6.662 ms
6.665 ms
6.681 ms
6.752 ms
6.724 ms
6.665 ms
6.730 ms
6.647 ms
6.658 ms
6.659 ms
6.666 ms
6.676 ms
6.670 ms
6.697 ms
6.646 ms
6.669 ms
6.643 ms
6.647 ms
6.663 ms
6.674 ms
6.699 ms
6.653 ms
6.648 ms
6.640 ms
6.655 ms
6.638 ms
6.743 ms
6.768 ms
6.719 ms
6.736 ms
6.740 ms
6.807 ms
6.731 ms
6.742 ms
6.745 ms
6.738 ms
6.740 ms
6.724 ms
6.801 ms
22.888 ms
22.518 ms
22.430 ms
22.453 ms
22.521 ms
22.410 ms
22.400 ms
21.910 ms
22.043 ms
21.951 ms
21.934 ms
21.977 ms
21.971 ms
21.927 ms
21.943 ms
21.944 ms
21.921 ms
22.857 ms
22.903 ms
22.806 ms
22.810 ms
22.829 ms
22.867 ms
22.881 ms
22.863 ms
22.864 ms
22.818 ms
22.870 ms
22.847 ms
22.416 ms
22.399 ms
22.359 ms
22.436 ms
22.466 ms
22.416 ms
22.418 ms
22.380 ms
22.411 ms
22.369 ms
22.381 ms
22.428 ms
21.995 ms
21.937 ms
21.953 ms
21.918 ms
21.936 ms
22.041 ms
21.946 ms
21.869 ms
21.951 ms
21.943 ms
21.920 ms
21.924 ms
21.931 ms
21.973 ms
21.978 ms
21.969 ms
21.955 ms
21.889 ms
21.909 ms
22.011 ms
21.995 ms
22.363 ms
22.478 ms
22.358 ms
24.569 ms
22.436 ms
22.377 ms
21.880 ms
21.986 ms
21.943 ms
21.957 ms
21.852 ms
22.467 ms
22.459 ms
22.364 ms
22.421 ms
22.438 ms
22.372 ms
22.399 ms
22.395 ms
22.394 ms
22.378 ms
22.377 ms
22.442 ms
6.388 ms
6.390 ms
6.396 ms
6.404 ms
6.427 ms
6.416 ms
6.384 ms
6.399 ms
6.384 ms
6.443 ms
6.384 ms
6.383 ms
6.403 ms
6.462 ms
6.407 ms
6.406 ms
6.397 ms
6.417 ms
6.445 ms
6.423 ms
6.416 ms
6.372 ms
6.368 ms
6.387 ms
6.384 ms
6.381 ms
6.377 ms
6.416 ms
6.381 ms
6.412 ms
6.372 ms
6.449 ms
6.403 ms
6.388 ms
6.420 ms
6.403 ms
6.384 ms
6.438 ms
6.396 ms
6.414 ms
6.379 ms
6.410 ms
6.409 ms
6.455 ms
6.389 ms
6.426 ms
6.411 ms
6.382 ms
6.385 ms
6.428 ms
6.419 ms
6.393 ms
6.378 ms
6.382 ms
6.421 ms
6.483 ms
6.402 ms
6.397 ms
6.399 ms
6.418 ms
6.446 ms
6.443 ms
6.387 ms
6.409 ms
6.379 ms
6.461 ms
6.411 ms
6.421 ms
6.459 ms
6.426 ms
6.384 ms
6.450 ms
6.370 ms
6.392 ms
22.832 ms
22.838 ms
22.845 ms
22.866 ms
22.868 ms
22.799 ms
22.839 ms
22.866 ms
22.844 ms
22.827 ms
22.884 ms
22.876 ms
22.936 ms
22.859 ms
22.893 ms
22.877 ms
22.854 ms
22.912 ms
22.856 ms
22.814 ms
22.882 ms
22.816 ms
22.850 ms
22.856 ms
22.831 ms
22.849 ms
22.843 ms
22.825 ms
22.815 ms
22.838 ms
22.831 ms
22.843 ms
22.877 ms
22.847 ms
22.797 ms
22.805 ms
22.898 ms
22.839 ms
22.876 ms
22.834 ms
22.860 ms
25.251 ms
22.903 ms
23.108 ms
22.866 ms
22.798 ms
22.827 ms
22.854 ms
22.906 ms
22.874 ms
22.860 ms
22.902 ms
22.872 ms
22.837 ms
22.815 ms
22.820 ms
22.867 ms
22.820 ms
22.848 ms
22.854 ms
22.867 ms
22.829 ms
22.865 ms
22.829 ms
22.838 ms
22.883 ms
22.826 ms
22.863 ms
22.838 ms
22.858 ms
22.899 ms
22.834 ms
22.832 ms
Network path / recorded observations

Network path observations.

16 observations

Choose a measurement type to see the closest of the available sampled observations to the selected chart point. Each probe is separate and may follow a different path.

Before

ICMP traceroute · Recorded address 5

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.394 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.170 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.198 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop6.799 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.227 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop8.504 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.796 msReply RTT AS8075 · Microsoft
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.126 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.926 msReply RTT AS8075 · Microsoft
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.264 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.167 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Probe hop8.457 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.793 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.150 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.044 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop6.999 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop8.905 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.743 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hopNo replyNo comparable RTT ASN unavailable
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination7.117 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.144 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.232 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.319 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop22.621 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop22.958 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop21.885 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop21.918 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hop23.438 msReply RTT AS8075 · Microsoft
  9. TTL 9 Probe hop22.102 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop18.265 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop21.511 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination21.311 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.137 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.769 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop2.758 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop6.594 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop6.701 msReply RTT AS8075 · Microsoft
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.209 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.475 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.776 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop8.495 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop7.188 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.553 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.125 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.649 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop1.063 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop7.540 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.975 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.248 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.296 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop7.187 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop8.007 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination7.271 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.127 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.566 msReply RTT ASN unavailable
  3. TTL 3 Probe hop1.853 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop23.934 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop149.412 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop24.795 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop23.632 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.137 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.652 msReply RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop23.685 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop23.599 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop24.579 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop24.260 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hop23.717 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.905 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop23.165 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination23.043 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.126 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.155 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hop1.982 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop27.693 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop23.410 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop23.153 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop24.662 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hop23.071 msReply RTT AS8075 · Microsoft
  9. TTL 9 Probe hop23.580 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop20.014 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop23.195 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination22.945 msReply RTT AS8075 · Microsoft

RTT is the round trip to each responding hop, not the delay of the preceding link. TTL order may omit routers and does not prove direct links. A missing reply is not proof of packet loss. ASN labels are dated address associations; they do not establish the forwarding path or the operator at the event time. Up to three recorded traces per method and period are selected across the archive. Where no individual trace is available, a comparison may summarize a window; MTR observations aggregate multiple probes. Address aliases are independent across measurement types.

Same method / same recorded address

Compare the traces.

Compare one selected trace from before the event with one during it. Values are individual replies, not a statistical comparison.

No same-address, same-method pair is available among the selected replay samples. This does not mean no other matching traces were recorded.

RTTs include the return path. Different responders, missing replies and independent probe flows limit what a change can localize. MTR snapshots remain separate in the replay.

Event timeline.

Possible SLA event. Times shown are UTC.

Event opened
UTC
Last event observation
UTC
Recovery observed
UTC

Recorded recovery describes this event, not current reachability.

02 / Assessment

Assessment.

Investigation stateRecovered
Path assessment

Elevated latency observed.

Endpoint round-trip time was elevated during part of the event. The available path observations do not identify where the increase occurred.

What we observed

  • A sustained increase in measured round trip time was observed.
  • The measured destination address changed across the comparison period.

Recording counts describe collected measurements, not application availability or packet loss. Exact packet paths and the return path remain unverified.

Measurements at a glance.

Baseline RTT6.737 msUsual round trip before the event
Last recorded event RTT6.416 msLast successful event recording
Event p95 RTT22.864 ms95th percentile of successful recordings
Change from baseline-0.320 msLast event RTT compared with the baseline
Successful / expected recordings140 / 140Recorded endpoint samples during the event

RTT is round trip time; p95 describes the upper range of successful recordings. Endpoint measurements differ from individual trace replies and are not an uptime percentage.

Record sources and timestamps
Analysis updated
UTC
Public snapshot published
UTC
Public observation window
– UTC

Event and source timestamps are UTC. The latency chart uses its selected timezone. Page refresh times are separate from measurement timestamps.

03 / Method and limits

Method and limits.

How to interpret the sampled path and its limits

Corroborating the path.

Comparisons use matching destinations before and during the event. ICMP traces use echo probes. TCP/443 traces send SYN probes to port 443 only; they do not complete a TCP handshake or perform a TLS or HTTP exchange.

The Stealth gNMI interface verifies the active route-table choice and maps its primary next hop to the Stealth logical interface, configured attachment and, where applicable, the known LAG member set at each snapshot. Stable Stealth replies, together with mapped interface evidence showing no corresponding errors or sustained capacity pressure, reduce the likelihood of a Stealth forwarding issue. An 80% load warning warrants investigation; it does not prove congestion. Lower interval averages can conceal bursts or queue pressure. Optical readings assess the physical link, not congestion.

What remains unseen.

Probe reply handling can differ from packet forwarding. A slow intermediate reply that disappears at later hops does not locate a forwarding problem. A destination that does not respond to a trace is not thereby shown to be unavailable.

Stealth does not use ECMP in this monitored scope. The route snapshot does not identify which physical LAG member carried a particular independent probe, attest line-card forwarding at that packet instant, prove the exact application packet flow or observe the return path. RTT includes the return path, which may differ. No remote reverse traceroute is available. Tunnels and silent routers may hide parts of the path. Address registration alone does not establish the forwarding operator or responsibility.

References: ICMP reply handling / RFC 1812 · Round trip measurements / RFC 2681 · Full methodology