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Root cause analysis / Investigation

copilot.com

Reference RCA-F2B06CA95FAD2C82

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.

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

02 Nov 2026 14:05 – 02 Nov 2026 16:59 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.
Recorded at (UTC)RTT
6.403 ms
6.384 ms
6.530 ms
6.398 ms
6.463 ms
6.443 ms
6.456 ms
6.435 ms
6.369 ms
6.402 ms
6.419 ms
6.429 ms
6.425 ms
6.420 ms
6.397 ms
6.468 ms
6.403 ms
6.380 ms
6.390 ms
6.444 ms
6.483 ms
6.489 ms
6.452 ms
6.465 ms
6.400 ms
6.419 ms
6.507 ms
6.397 ms
6.420 ms
6.568 ms
6.477 ms
6.574 ms
6.389 ms
6.411 ms
6.480 ms
6.419 ms
6.411 ms
6.416 ms
6.428 ms
6.449 ms
6.412 ms
6.461 ms
6.929 ms
6.388 ms
6.460 ms
6.381 ms
6.467 ms
6.371 ms
6.537 ms
6.415 ms
6.445 ms
6.382 ms
6.480 ms
6.480 ms
6.495 ms
6.412 ms
6.379 ms
6.399 ms
6.493 ms
6.502 ms
6.491 ms
6.386 ms
6.390 ms
6.466 ms
6.493 ms
6.437 ms
6.509 ms
6.409 ms
6.399 ms
6.409 ms
6.401 ms
6.391 ms
6.366 ms
6.455 ms
6.424 ms
6.396 ms
6.437 ms
6.540 ms
6.484 ms
6.438 ms
6.393 ms
6.536 ms
6.484 ms
6.500 ms
6.413 ms
6.454 ms
6.419 ms
6.463 ms
6.478 ms
6.404 ms
6.401 ms
6.407 ms
6.410 ms
6.408 ms
6.489 ms
6.506 ms
6.404 ms
6.450 ms
6.425 ms
6.411 ms
6.533 ms
6.488 ms
6.412 ms
6.637 ms
6.659 ms
6.642 ms
6.621 ms
6.667 ms
6.638 ms
6.724 ms
6.674 ms
6.833 ms
6.671 ms
6.633 ms
6.635 ms
6.661 ms
6.688 ms
6.641 ms
6.646 ms
6.675 ms
6.683 ms
6.686 ms
6.640 ms
6.671 ms
6.662 ms
6.710 ms
6.736 ms
6.689 ms
22.824 ms
22.829 ms
22.826 ms
22.965 ms
22.915 ms
22.785 ms
22.820 ms
22.871 ms
22.864 ms
22.888 ms
22.850 ms
22.782 ms
22.834 ms
22.835 ms
22.836 ms
22.901 ms
22.827 ms
22.798 ms
22.849 ms
22.859 ms
22.939 ms
22.886 ms
22.873 ms
22.822 ms
22.904 ms
22.852 ms
22.854 ms
22.833 ms
22.812 ms
22.917 ms
22.881 ms
22.806 ms
22.854 ms
22.880 ms
22.851 ms
22.864 ms
22.812 ms
22.895 ms
22.879 ms
22.837 ms
22.880 ms
22.881 ms
22.886 ms
22.819 ms
22.930 ms
22.862 ms
22.858 ms
22.820 ms
22.849 ms
22.950 ms
22.848 ms
22.823 ms
22.777 ms
22.836 ms
22.898 ms
22.812 ms
22.821 ms
22.914 ms
22.815 ms
22.822 ms
22.875 ms
22.834 ms
22.833 ms
22.836 ms
22.825 ms
22.876 ms
22.845 ms
22.915 ms
6.501 ms
6.514 ms
6.516 ms
6.542 ms
6.504 ms
6.637 ms
6.547 ms
6.521 ms
6.506 ms
6.502 ms
6.513 ms
6.518 ms
6.507 ms
6.558 ms
6.519 ms
6.531 ms
6.531 ms
6.523 ms
6.521 ms
6.535 ms
6.518 ms
6.509 ms
6.490 ms
6.540 ms
6.521 ms
6.514 ms
6.528 ms
6.544 ms
6.567 ms
6.564 ms
6.534 ms
6.535 ms
6.551 ms
6.524 ms
6.535 ms
6.581 ms
6.498 ms
22.847 ms
22.900 ms
22.851 ms
23.217 ms
22.831 ms
22.789 ms
22.839 ms
22.852 ms
22.875 ms
22.826 ms
22.859 ms
22.887 ms
22.872 ms
22.802 ms
22.862 ms
22.851 ms
22.845 ms
22.910 ms
22.815 ms
22.872 ms
22.824 ms
22.884 ms
22.890 ms
22.891 ms
22.843 ms
22.878 ms
22.822 ms
22.851 ms
22.859 ms
22.898 ms
22.883 ms
22.874 ms
22.839 ms
22.839 ms
22.968 ms
22.812 ms
22.886 ms
22.898 ms
22.888 ms
22.839 ms
22.918 ms
22.873 ms
22.907 ms
22.823 ms
22.861 ms
22.876 ms
22.871 ms
22.889 ms
22.818 ms
22.834 ms
22.837 ms
22.883 ms
22.886 ms
22.901 ms
22.855 ms
22.807 ms
22.788 ms
22.837 ms
22.845 ms
22.880 ms
22.840 ms
22.858 ms
22.868 ms
22.820 ms
22.848 ms
22.832 ms
22.853 ms
22.853 ms
22.820 ms
22.867 ms
22.831 ms
22.830 ms
22.793 ms
22.813 ms
22.875 ms
22.861 ms
22.845 ms
6.404 ms
6.381 ms
6.764 ms
6.711 ms
6.743 ms
6.767 ms
6.788 ms
6.732 ms
6.725 ms
6.738 ms
6.733 ms
6.743 ms
6.769 ms
6.718 ms
6.737 ms
6.774 ms
6.752 ms
6.727 ms
6.770 ms
6.750 ms
6.758 ms
6.741 ms
6.777 ms
6.732 ms
6.741 ms
6.758 ms
6.727 ms
6.793 ms
6.771 ms
6.742 ms
6.757 ms
6.930 ms
6.758 ms
6.732 ms
6.716 ms
6.746 ms
6.766 ms
6.745 ms
6.761 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 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.124 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.680 msReply RTT AS8075 · Microsoft
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.168 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.786 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop148.025 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.927 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.268 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 Destination6.746 msReply RTT AS8075 · Microsoft
Before

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

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

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.142 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hop1.048 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop7.053 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop8.600 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop6.358 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 Destination6.816 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.125 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.498 msReply RTT AS8075 · Microsoft
During

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 hop0.980 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop6.615 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop6.884 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  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 Destination6.912 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 5

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.122 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.172 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.982 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop23.395 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop24.800 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop23.858 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hop23.245 msReply RTT AS8075 · Microsoft
  9. TTL 9 Probe hop23.953 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.868 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop22.803 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination26.600 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.134 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.141 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.985 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop6.875 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.412 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 Destination6.832 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.182 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.193 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop3.570 msReply RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop7.744 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 Destination6.679 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 5

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.145 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.173 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 hop24.998 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop23.391 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop24.185 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hopNo replyNo comparable RTT ASN unavailable
  8. TTL 8 Probe hop24.750 msReply RTT AS8075 · Microsoft
  9. TTL 9 Probe hop23.668 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.967 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop29.823 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination29.576 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.130 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.930 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.216 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.355 msReply RTT ASN unavailable
  3. TTL 3 Probe hop1.093 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop7.348 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.092 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 Destination6.923 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 RTT6.681 msUsual round trip before the event
Last recorded event RTT6.524 msLast successful event recording
Event p95 RTT22.915 ms95th percentile of successful recordings
Change from baseline-0.157 msLast event RTT compared with the baseline
Successful / expected recordings110 / 110Recorded 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