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Root cause analysis / Investigation

copilot.com

Reference RCA-912092D840D6F34B

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

06 Nov 2026 17:30 – 06 Nov 2026 20:24 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.
Recorded at (UTC)RTT
6.734 ms
6.753 ms
6.774 ms
6.771 ms
6.776 ms
6.801 ms
6.747 ms
6.730 ms
6.825 ms
6.739 ms
6.734 ms
6.782 ms
6.741 ms
6.758 ms
6.728 ms
6.757 ms
6.746 ms
6.723 ms
7.022 ms
6.721 ms
6.779 ms
6.729 ms
6.749 ms
6.751 ms
6.720 ms
6.787 ms
6.763 ms
6.735 ms
6.748 ms
6.730 ms
6.741 ms
6.737 ms
6.767 ms
6.751 ms
6.774 ms
6.775 ms
6.740 ms
6.730 ms
6.750 ms
6.737 ms
6.739 ms
6.765 ms
6.881 ms
6.865 ms
6.863 ms
6.834 ms
6.847 ms
6.864 ms
6.768 ms
6.774 ms
6.746 ms
6.747 ms
6.761 ms
6.739 ms
6.765 ms
6.829 ms
6.763 ms
6.748 ms
6.751 ms
6.290 ms
6.308 ms
6.301 ms
6.306 ms
6.289 ms
6.282 ms
6.352 ms
6.293 ms
6.325 ms
6.304 ms
6.322 ms
6.271 ms
6.316 ms
6.366 ms
6.288 ms
6.285 ms
6.316 ms
6.287 ms
6.326 ms
6.310 ms
6.283 ms
6.281 ms
6.426 ms
6.424 ms
6.391 ms
6.457 ms
6.397 ms
6.389 ms
6.401 ms
6.403 ms
6.422 ms
6.415 ms
6.387 ms
6.429 ms
6.386 ms
6.378 ms
6.406 ms
6.404 ms
6.392 ms
6.429 ms
6.448 ms
6.399 ms
6.418 ms
6.417 ms
6.412 ms
6.386 ms
6.389 ms
6.422 ms
6.409 ms
6.296 ms
6.321 ms
6.291 ms
6.323 ms
6.355 ms
6.318 ms
6.090 ms
6.087 ms
6.094 ms
6.160 ms
6.111 ms
6.083 ms
6.102 ms
6.123 ms
6.092 ms
6.071 ms
6.110 ms
6.186 ms
22.880 ms
22.929 ms
22.863 ms
22.997 ms
22.849 ms
22.826 ms
22.864 ms
22.836 ms
22.829 ms
22.813 ms
22.796 ms
22.807 ms
22.826 ms
22.814 ms
22.853 ms
22.806 ms
22.864 ms
22.879 ms
22.834 ms
22.870 ms
22.849 ms
22.839 ms
22.797 ms
22.898 ms
22.894 ms
22.799 ms
22.890 ms
22.840 ms
22.848 ms
22.836 ms
23.194 ms
22.891 ms
22.805 ms
22.795 ms
23.031 ms
22.896 ms
22.848 ms
22.955 ms
22.890 ms
22.947 ms
22.868 ms
22.814 ms
22.858 ms
22.881 ms
22.872 ms
22.844 ms
22.884 ms
22.872 ms
22.905 ms
22.791 ms
23.069 ms
22.864 ms
23.249 ms
22.886 ms
22.854 ms
22.884 ms
22.800 ms
22.865 ms
22.893 ms
22.868 ms
22.768 ms
22.861 ms
22.842 ms
22.791 ms
22.822 ms
6.723 ms
6.736 ms
6.738 ms
6.725 ms
6.759 ms
6.724 ms
6.730 ms
6.715 ms
6.806 ms
6.746 ms
6.720 ms
6.749 ms
6.799 ms
6.740 ms
6.736 ms
6.749 ms
6.757 ms
6.755 ms
6.729 ms
6.722 ms
6.751 ms
6.728 ms
6.737 ms
6.790 ms
6.795 ms
6.729 ms
6.773 ms
6.740 ms
6.732 ms
6.739 ms
6.744 ms
6.793 ms
6.726 ms
6.761 ms
6.772 ms
6.739 ms
6.724 ms
6.743 ms
6.737 ms
6.749 ms
6.732 ms
6.733 ms
6.722 ms
6.745 ms
6.780 ms
6.716 ms
6.735 ms
6.744 ms
6.771 ms
6.719 ms
6.910 ms
6.744 ms
6.765 ms
6.726 ms
6.727 ms
6.724 ms
6.751 ms
6.751 ms
6.717 ms
6.724 ms
6.758 ms
6.755 ms
6.720 ms
6.738 ms
6.797 ms
6.730 ms
6.741 ms
6.736 ms
6.763 ms
6.742 ms
6.740 ms
6.722 ms
6.739 ms
6.726 ms
6.748 ms
6.776 ms
6.717 ms
6.740 ms
6.769 ms
6.754 ms
6.745 ms
6.736 ms
6.753 ms
6.747 ms
6.774 ms
6.735 ms
6.755 ms
6.775 ms
6.793 ms
6.753 ms
6.763 ms
6.755 ms
6.786 ms
6.736 ms
6.759 ms
6.722 ms
6.725 ms
6.736 ms
6.741 ms
6.752 ms
6.740 ms
6.733 ms
6.720 ms
6.733 ms
6.742 ms
6.752 ms
6.768 ms
6.748 ms
6.755 ms
6.759 ms
6.810 ms
6.750 ms
6.829 ms
6.740 ms
6.729 ms
6.765 ms
6.816 ms
6.744 ms
6.727 ms
6.755 ms
6.729 ms
6.785 ms
6.728 ms
6.778 ms
6.784 ms
6.773 ms
6.788 ms
6.761 ms
6.746 ms
6.762 ms
6.770 ms
6.743 ms
6.600 ms
6.629 ms
6.626 ms
6.605 ms
6.640 ms
6.602 ms
6.622 ms
6.592 ms
6.600 ms
6.599 ms
6.602 ms
6.618 ms
6.583 ms
6.596 ms
6.665 ms
6.593 ms
6.600 ms
6.685 ms
6.607 ms
6.610 ms
6.618 ms
6.609 ms
6.641 ms
6.593 ms
6.613 ms
6.585 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 3

Recorded trace · destination not reached by this trace


to UTC

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

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.137 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 hop7.101 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop8.480 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 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.436 msReply RTT AS8075 · Microsoft
Before

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.120 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.134 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 hop6.963 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 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 Destination6.725 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.965 msReply RTT AS8075 · Microsoft
During

TCP traceroute / 443 · Recorded address 1

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 hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop7.111 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 Destination6.290 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 6

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.123 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop13.087 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop1.716 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop24.046 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop23.791 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop70.530 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop24.084 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hop24.283 msReply RTT AS8075 · Microsoft
  9. TTL 9 Probe hop23.778 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.959 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop22.883 msReply RTT AS8075 · Microsoft
During

TCP traceroute / 443 · Recorded address 6

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.178 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.003 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop23.594 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop23.403 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop93.395 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop23.201 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hop23.830 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.756 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop23.141 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination22.977 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.131 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.189 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 hop6.782 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 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 Destination6.682 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.138 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.157 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hop0.819 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop7.133 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop58.171 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Probe hop6.973 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 Destination7.098 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.156 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.230 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 hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop7.370 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.452 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 Destination6.663 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 5

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.133 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.156 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 hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop7.337 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop6.793 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 Destination6.986 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 RTT6.735 msUsual round trip before the event
Last recorded event RTT6.737 msLast successful event recording
Event p95 RTT22.951 ms95th percentile of successful recordings
Change from baseline+0.001 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