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Root cause analysis / Investigation

copilot.com

Reference RCA-FA03D21FFEC59E3D

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

09 Nov 2026 15:25 – 09 Nov 2026 18:29 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; displayed points are a sample of the retained records.
Recorded at (UTC)RTT
6.545 ms
6.574 ms
6.625 ms
6.592 ms
6.579 ms
6.540 ms
6.865 ms
6.490 ms
6.456 ms
6.523 ms
6.488 ms
6.540 ms
6.524 ms
6.479 ms
6.462 ms
6.510 ms
6.516 ms
6.485 ms
6.471 ms
6.528 ms
6.475 ms
6.461 ms
6.478 ms
6.475 ms
17.691 ms
17.689 ms
17.662 ms
17.688 ms
17.704 ms
17.707 ms
17.735 ms
17.695 ms
17.696 ms
17.716 ms
17.686 ms
17.696 ms
17.688 ms
17.694 ms
17.736 ms
17.695 ms
17.695 ms
17.685 ms
6.073 ms
6.060 ms
6.085 ms
6.063 ms
6.072 ms
6.106 ms
6.071 ms
6.110 ms
6.096 ms
6.106 ms
6.085 ms
6.070 ms
6.075 ms
6.085 ms
6.088 ms
6.069 ms
6.102 ms
6.097 ms
6.118 ms
6.078 ms
6.087 ms
6.088 ms
6.111 ms
6.109 ms
6.095 ms
6.106 ms
6.071 ms
6.079 ms
6.068 ms
6.126 ms
6.143 ms
6.125 ms
6.099 ms
6.131 ms
6.076 ms
6.114 ms
6.121 ms
6.101 ms
6.090 ms
6.103 ms
6.081 ms
6.115 ms
6.106 ms
6.094 ms
6.100 ms
6.092 ms
6.082 ms
6.141 ms
6.079 ms
6.075 ms
6.065 ms
6.104 ms
6.070 ms
6.075 ms
6.070 ms
6.067 ms
6.129 ms
6.113 ms
6.089 ms
6.089 ms
6.086 ms
6.123 ms
6.122 ms
6.080 ms
6.108 ms
6.076 ms
6.137 ms
6.078 ms
6.089 ms
6.104 ms
6.148 ms
6.145 ms
6.069 ms
6.104 ms
6.080 ms
6.082 ms
6.073 ms
6.144 ms
6.150 ms
6.064 ms
6.069 ms
6.107 ms
6.065 ms
17.541 ms
17.605 ms
17.627 ms
17.577 ms
17.605 ms
17.619 ms
17.579 ms
17.579 ms
17.589 ms
17.621 ms
17.590 ms
17.569 ms
18.003 ms
17.998 ms
17.980 ms
17.982 ms
18.003 ms
17.989 ms
18.169 ms
17.972 ms
17.974 ms
17.985 ms
17.992 ms
18.000 ms
18.018 ms
17.995 ms
17.973 ms
17.970 ms
17.988 ms
17.977 ms
18.027 ms
17.996 ms
18.011 ms
17.617 ms
17.608 ms
17.544 ms
17.610 ms
17.627 ms
17.581 ms
17.590 ms
17.595 ms
17.601 ms
17.629 ms
17.604 ms
17.603 ms
17.598 ms
17.616 ms
17.579 ms
17.608 ms
17.625 ms
17.581 ms
17.572 ms
17.584 ms
17.582 ms
17.572 ms
17.990 ms
17.987 ms
17.987 ms
17.975 ms
17.989 ms
17.982 ms
17.978 ms
17.984 ms
18.005 ms
18.043 ms
17.993 ms
18.003 ms
18.004 ms
17.973 ms
17.994 ms
18.030 ms
18.004 ms
18.003 ms
17.981 ms
18.024 ms
17.992 ms
18.022 ms
18.000 ms
18.001 ms
18.001 ms
6.708 ms
6.784 ms
6.712 ms
6.739 ms
6.709 ms
6.726 ms
6.759 ms
6.741 ms
6.703 ms
6.769 ms
6.717 ms
6.712 ms
6.717 ms
6.742 ms
6.689 ms
6.728 ms
6.721 ms
6.737 ms
6.687 ms
6.700 ms
6.730 ms
6.688 ms
6.757 ms
6.733 ms
6.725 ms
6.714 ms
6.712 ms
6.324 ms
6.364 ms
7.139 ms
6.289 ms
6.287 ms
6.277 ms
6.555 ms
6.379 ms
6.279 ms
6.285 ms
6.426 ms
6.278 ms
6.447 ms
6.289 ms
6.279 ms
6.270 ms
6.282 ms
6.385 ms
6.300 ms
6.288 ms
6.309 ms
6.315 ms
6.275 ms
6.311 ms
6.398 ms
6.292 ms
6.313 ms
6.304 ms
6.279 ms
6.290 ms
6.280 ms
6.704 ms
6.360 ms
6.406 ms
6.338 ms
6.287 ms
6.293 ms
6.269 ms
6.342 ms
6.397 ms
6.286 ms
6.285 ms
6.292 ms
6.329 ms
6.299 ms
6.458 ms
6.292 ms
6.359 ms
6.415 ms
6.284 ms
6.289 ms
6.292 ms
6.295 ms
6.311 ms
6.319 ms
6.308 ms
6.327 ms
6.341 ms
6.293 ms
6.421 ms
6.413 ms
6.336 ms
6.272 ms
6.321 ms
6.358 ms
6.281 ms
6.359 ms
6.329 ms
6.601 ms
6.383 ms
6.330 ms
6.344 ms
6.504 ms
6.449 ms
6.353 ms
6.468 ms
6.356 ms
6.346 ms
6.296 ms
6.290 ms
6.278 ms
6.351 ms
6.296 ms
6.387 ms
6.417 ms
6.432 ms
6.304 ms
6.377 ms
6.441 ms
6.286 ms
6.284 ms
6.354 ms
6.291 ms
6.478 ms
6.280 ms
6.386 ms
6.348 ms
6.299 ms
6.307 ms
6.288 ms
6.344 ms
6.350 ms
6.402 ms
6.438 ms
6.404 ms
6.404 ms
6.400 ms
6.564 ms
6.409 ms
6.595 ms
6.392 ms
6.373 ms
6.496 ms
6.363 ms
6.268 ms
6.405 ms
6.281 ms
6.387 ms
6.387 ms
6.399 ms
6.722 ms
6.588 ms
6.710 ms
6.658 ms
6.579 ms
6.579 ms
6.537 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 hop0.113 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.534 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hop0.797 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop7.176 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop7.446 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 Destination6.700 msReply RTT AS8075 · Microsoft
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.118 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.873 msReply RTT AS8075 · Microsoft
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.146 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 hop78.238 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.879 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop8.784 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 Destination6.620 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.124 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.161 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.899 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 hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop5.887 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 Destination6.747 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.225 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.145 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop6.801 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop18.929 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop19.486 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop19.917 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hop18.492 msReply RTT AS8075 · Microsoft
  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 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination18.166 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.108 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.144 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 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 Destination6.542 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.160 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.229 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 hop6.925 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop6.706 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 Destination6.560 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop3.305 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.279 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop16.547 msReply RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop68.985 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop5.933 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 Destination6.386 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

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

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.162 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 hop8.334 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop8.414 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop8.248 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 Destination6.330 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 1

Before: UTC · During: UTC

Same destination address and probe method. A matching TTL does not establish the same forwarding path.
TTLBefore RTTDuring RTTResponding address
10.118 msAS8002 · Stealth0.124 msAS8002 · StealthSame responder
20.873 msAS8075 · MicrosoftNot recordedNot established
TCP traceroute / 443 · Recorded address 1

Before: UTC · During: UTC

Same destination address and probe method. A matching TTL does not establish the same forwarding path.
TTLBefore RTTDuring RTTResponding address
10.146 msAS8002 · Stealth0.161 msAS8002 · StealthSame responder
2No reply0.899 msAS8075 · MicrosoftNot established
3No replyNo replyNot established
478.238 msAS8075 · MicrosoftNo replyNot established
57.879 msAS8075 · MicrosoftNo replyNot established
68.784 msAS8075 · Microsoft5.887 msAS8075 · MicrosoftDifferent responders
7No replyNo replyNot established
8No replyNo replyNot established
9No replyNo replyNot established
10No replyNo replyNot established
11No reply6.747 msAS8075 · MicrosoftNot established
126.620 msAS8075 · MicrosoftNot recordedNot established

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 RTT6.719 msUsual round trip before the event
Last recorded event RTT6.379 msLast successful event recording
Event p95 RTT18.015 ms95th percentile of successful recordings
Change from baseline-0.339 msLast event RTT compared with the baseline
Successful / expected recordings130 / 130Recorded 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