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Root cause analysis / Investigation

copilot.com

Reference RCA-06CE3D98DC2A99F7

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

28 Oct 2026 17:40 – 28 Oct 2026 20:29 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
6.661 ms
6.706 ms
6.691 ms
6.695 ms
6.720 ms
6.719 ms
6.679 ms
6.694 ms
6.674 ms
6.690 ms
6.727 ms
6.650 ms
6.682 ms
6.666 ms
6.668 ms
6.662 ms
6.667 ms
6.678 ms
6.735 ms
6.648 ms
6.738 ms
6.685 ms
6.793 ms
6.698 ms
6.688 ms
6.721 ms
6.753 ms
6.814 ms
6.751 ms
6.741 ms
6.808 ms
6.729 ms
6.614 ms
6.632 ms
6.659 ms
6.595 ms
6.606 ms
6.614 ms
6.614 ms
6.638 ms
6.661 ms
6.651 ms
6.641 ms
6.596 ms
6.681 ms
6.639 ms
6.606 ms
6.895 ms
6.670 ms
6.663 ms
6.650 ms
6.674 ms
6.650 ms
6.618 ms
6.707 ms
6.798 ms
6.723 ms
6.705 ms
6.757 ms
6.742 ms
6.771 ms
6.731 ms
6.732 ms
6.736 ms
6.763 ms
6.739 ms
6.748 ms
6.704 ms
6.746 ms
6.775 ms
6.754 ms
6.714 ms
6.731 ms
6.749 ms
6.835 ms
6.735 ms
7.117 ms
6.768 ms
6.745 ms
6.758 ms
6.782 ms
6.726 ms
6.748 ms
6.774 ms
6.723 ms
6.720 ms
6.762 ms
6.711 ms
6.736 ms
6.713 ms
6.756 ms
6.825 ms
6.747 ms
6.714 ms
6.728 ms
6.708 ms
6.746 ms
6.781 ms
6.778 ms
6.726 ms
6.737 ms
6.763 ms
6.713 ms
6.701 ms
6.725 ms
6.724 ms
6.764 ms
6.748 ms
6.743 ms
6.711 ms
6.707 ms
6.700 ms
6.759 ms
6.752 ms
6.703 ms
6.736 ms
6.741 ms
6.780 ms
6.768 ms
6.723 ms
6.765 ms
22.926 ms
22.856 ms
22.877 ms
22.948 ms
22.919 ms
22.907 ms
22.904 ms
22.929 ms
22.907 ms
22.903 ms
22.858 ms
22.982 ms
22.917 ms
22.907 ms
22.891 ms
22.832 ms
22.917 ms
22.862 ms
22.871 ms
23.019 ms
22.910 ms
22.898 ms
22.903 ms
22.923 ms
22.877 ms
22.907 ms
22.902 ms
22.912 ms
22.867 ms
22.933 ms
22.997 ms
22.966 ms
22.835 ms
22.936 ms
22.972 ms
22.929 ms
22.913 ms
22.930 ms
22.960 ms
22.956 ms
22.874 ms
22.880 ms
22.896 ms
22.920 ms
22.872 ms
22.901 ms
22.923 ms
22.874 ms
22.913 ms
22.883 ms
22.899 ms
22.941 ms
22.898 ms
22.950 ms
22.931 ms
22.953 ms
22.919 ms
22.934 ms
22.971 ms
22.898 ms
6.757 ms
6.765 ms
6.736 ms
6.764 ms
6.769 ms
6.772 ms
6.748 ms
6.752 ms
6.768 ms
6.761 ms
6.766 ms
6.862 ms
7.073 ms
6.751 ms
6.742 ms
6.778 ms
6.784 ms
6.778 ms
6.722 ms
6.772 ms
6.736 ms
6.754 ms
6.767 ms
6.729 ms
6.736 ms
6.776 ms
6.723 ms
6.782 ms
6.724 ms
6.753 ms
6.880 ms
6.741 ms
6.805 ms
6.756 ms
6.776 ms
6.771 ms
6.757 ms
6.778 ms
6.783 ms
6.801 ms
6.738 ms
6.777 ms
6.729 ms
6.776 ms
6.794 ms
6.752 ms
6.772 ms
6.742 ms
6.724 ms
6.795 ms
6.742 ms
6.720 ms
6.756 ms
6.728 ms
6.789 ms
6.748 ms
6.745 ms
6.734 ms
6.843 ms
6.732 ms
6.763 ms
6.742 ms
6.826 ms
6.784 ms
6.803 ms
6.749 ms
6.752 ms
6.750 ms
6.798 ms
6.736 ms
6.788 ms
6.720 ms
6.740 ms
6.744 ms
6.738 ms
6.789 ms
6.754 ms
6.759 ms
6.789 ms
6.785 ms
6.749 ms
6.774 ms
6.795 ms
6.723 ms
6.785 ms
6.788 ms
6.733 ms
6.774 ms
6.846 ms
6.741 ms
6.818 ms
6.720 ms
6.726 ms
6.733 ms
6.766 ms
6.737 ms
6.751 ms
6.735 ms
6.811 ms
6.738 ms
6.772 ms
6.749 ms
6.793 ms
6.729 ms
6.776 ms
6.867 ms
6.791 ms
6.858 ms
6.870 ms
6.788 ms
6.796 ms
6.412 ms
6.424 ms
6.423 ms
6.485 ms
6.438 ms
6.418 ms
6.414 ms
6.422 ms
6.432 ms
6.595 ms
6.425 ms
6.440 ms
6.402 ms
6.435 ms
6.472 ms
6.446 ms
6.464 ms
6.459 ms
6.437 ms
6.406 ms
6.418 ms
6.403 ms
6.402 ms
6.520 ms
6.414 ms
6.393 ms
6.430 ms
6.448 ms
6.459 ms
6.407 ms
6.550 ms
6.496 ms
6.547 ms
6.653 ms
6.410 ms
6.708 ms
6.437 ms
6.419 ms
6.426 ms
6.476 ms
6.448 ms
7.498 ms
6.473 ms
6.430 ms
6.465 ms
6.426 ms
6.471 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 hop0.127 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.215 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 hop7.342 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop7.964 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop8.332 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 Destination7.080 msReply RTT AS8075 · Microsoft
Before

ICMP traceroute · Recorded address 6

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.116 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 6

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.176 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 hop32.548 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.128 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.155 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop8.392 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 Destination7.253 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 6

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.136 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.160 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 hop23.488 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop23.913 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 hop23.447 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop20.179 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop23.033 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination22.950 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.149 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.192 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop48.057 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 hop23.428 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop31.123 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop23.024 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hop23.813 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.852 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop23.074 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination22.964 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.129 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.166 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 hop91.134 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop7.629 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 Destination7.155 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.117 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop5.830 msReply RTT ASN unavailable
  3. TTL 3 Probe hop1.622 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop140.095 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.480 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop19.334 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop6.272 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.256 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 hop7.755 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.908 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 Destination7.033 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.127 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.967 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop0.868 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop7.044 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.186 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop6.929 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.174 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.944 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.280 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop27.688 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 Destination6.764 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.125 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.024 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.151 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 hop6.526 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.954 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.465 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 Destination7.034 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.

ICMP traceroute · Recorded address 6

Before: UTC · During: UTC

Same destination address and probe method. A matching TTL does not establish the same forwarding path.
TTLBefore RTTDuring RTTResponding address
10.116 msAS8002 · Stealth0.136 msAS8002 · StealthSame responder

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 RTT6.704 msUsual round trip before the event
Last recorded event RTT6.783 msLast successful event recording
Event p95 RTT22.966 ms95th percentile of successful recordings
Change from baseline+0.080 msLast event RTT compared with the baseline
Successful / expected recordings100 / 100Recorded 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