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Root cause analysis / Investigation

copilot.microsoft.com

Reference RCA-8DD916BDBAD93E55

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

05 Nov 2026 20:35 – 05 Nov 2026 23:34 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
3.605 ms
6.366 ms
1.002 ms
1.014 ms
5.372 ms
1.001 ms
5.742 ms
9.357 ms
1.206 ms
1.370 ms
1.002 ms
1.027 ms
1.030 ms
1.371 ms
0.975 ms
1.394 ms
1.340 ms
1.014 ms
0.956 ms
1.605 ms
1.400 ms
1.357 ms
5.469 ms
1.384 ms
0.993 ms
1.228 ms
0.964 ms
1.022 ms
8.146 ms
1.007 ms
1.389 ms
1.371 ms
1.395 ms
1.378 ms
1.381 ms
1.395 ms
1.314 ms
0.961 ms
0.958 ms
1.410 ms
8.478 ms
1.382 ms
1.348 ms
0.945 ms
0.952 ms
0.992 ms
0.989 ms
18.661 ms
0.957 ms
1.009 ms
0.973 ms
1.786 ms
1.039 ms
0.953 ms
0.967 ms
1.370 ms
1.404 ms
12.917 ms
0.980 ms
0.970 ms
1.000 ms
1.355 ms
1.003 ms
1.071 ms
1.382 ms
1.450 ms
1.144 ms
1.439 ms
2.479 ms
1.000 ms
1.060 ms
1.451 ms
1.415 ms
1.411 ms
0.958 ms
0.962 ms
1.387 ms
0.968 ms
1.388 ms
1.487 ms
1.374 ms
1.435 ms
0.997 ms
1.389 ms
1.372 ms
0.959 ms
1.035 ms
1.391 ms
0.964 ms
0.993 ms
0.970 ms
1.368 ms
1.488 ms
1.389 ms
1.710 ms
1.370 ms
1.080 ms
0.988 ms
1.017 ms
0.969 ms
1.007 ms
1.442 ms
1.015 ms
1.398 ms
1.082 ms
20.045 ms
0.978 ms
1.062 ms
1.383 ms
0.977 ms
1.002 ms
0.989 ms
1.093 ms
1.164 ms
1.404 ms
1.394 ms
1.411 ms
1.383 ms
1.424 ms
1.028 ms
1.408 ms
1.386 ms
1.019 ms
1.013 ms
9.746 ms
1.062 ms
0.971 ms
1.368 ms
1.116 ms
1.063 ms
1.475 ms
18.119 ms
1.230 ms
1.002 ms
1.437 ms
0.959 ms
1.390 ms
19.820 ms
1.058 ms
1.029 ms
1.345 ms
1.015 ms
1.457 ms
1.405 ms
1.383 ms
1.382 ms
1.316 ms
10.631 ms
1.280 ms
0.951 ms
0.997 ms
1.370 ms
1.426 ms
1.380 ms
1.387 ms
2.970 ms
0.949 ms
0.931 ms
1.373 ms
1.384 ms
1.362 ms
1.052 ms
0.998 ms
8.279 ms
1.060 ms
0.975 ms
0.973 ms
1.395 ms
0.932 ms
0.975 ms
4.403 ms
0.994 ms
1.403 ms
1.015 ms
1.351 ms
1.012 ms
1.009 ms
1.378 ms
1.352 ms
0.982 ms
1.385 ms
1.418 ms
1.444 ms
1.381 ms
1.012 ms
1.471 ms
0.996 ms
13.030 ms
1.356 ms
1.058 ms
1.459 ms
1.037 ms
1.859 ms
1.032 ms
6.184 ms
0.944 ms
1.229 ms
1.365 ms
0.984 ms
1.008 ms
1.407 ms
0.999 ms
1.398 ms
1.360 ms
1.402 ms
1.008 ms
13.528 ms
18.635 ms
1.074 ms
0.963 ms
1.387 ms
1.029 ms
1.012 ms
0.999 ms
1.365 ms
1.018 ms
1.367 ms
1.024 ms
1.372 ms
1.350 ms
1.011 ms
1.037 ms
1.399 ms
0.960 ms
1.004 ms
1.352 ms
1.403 ms
1.357 ms
1.350 ms
0.990 ms
1.392 ms
1.383 ms
0.970 ms
1.068 ms
1.035 ms
0.962 ms
1.040 ms
1.055 ms
1.037 ms
1.021 ms
2.945 ms
1.410 ms
1.083 ms
1.015 ms
1.378 ms
1.336 ms
0.964 ms
0.971 ms
1.001 ms
1.343 ms
1.398 ms
0.942 ms
1.401 ms
1.019 ms
1.402 ms
1.500 ms
1.404 ms
1.041 ms
1.023 ms
1.047 ms
1.050 ms
1.001 ms
0.973 ms
0.991 ms
1.533 ms
1.010 ms
1.390 ms
0.959 ms
1.499 ms
0.991 ms
1.320 ms
1.354 ms
1.364 ms
0.963 ms
0.942 ms
1.377 ms
0.954 ms
1.392 ms
1.029 ms
0.956 ms
0.969 ms
1.007 ms
1.038 ms
0.984 ms
0.978 ms
1.187 ms
1.424 ms
1.004 ms
1.023 ms
1.393 ms
0.970 ms
0.980 ms
1.345 ms
0.996 ms
1.351 ms
1.002 ms
1.379 ms
1.457 ms
0.945 ms
0.988 ms
1.390 ms
1.358 ms
0.953 ms
1.358 ms
1.356 ms
1.023 ms
1.354 ms
1.331 ms
1.387 ms
1.534 ms
1.052 ms
1.387 ms
1.359 ms
0.987 ms
1.396 ms
0.965 ms
1.038 ms
0.980 ms
1.034 ms
1.412 ms
1.011 ms
1.011 ms
0.980 ms
1.025 ms
1.043 ms
1.479 ms
0.967 ms
1.001 ms
1.001 ms
1.007 ms
0.944 ms
1.366 ms
0.980 ms
0.970 ms
1.021 ms
1.021 ms
1.603 ms
1.358 ms
1.359 ms
1.382 ms
1.366 ms
1.358 ms
1.405 ms
1.377 ms
1.362 ms
1.021 ms
1.477 ms
1.385 ms
1.420 ms
1.425 ms
1.022 ms
1.062 ms
1.368 ms
1.048 ms
0.968 ms
1.044 ms
1.379 ms
1.383 ms
0.969 ms
Network path / recorded observations

Network path observations.

17 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 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.533 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.179 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop27.524 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.141 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.180 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.515 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination19.665 msReply RTT AS13335 · Cloudflare
Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.131 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.201 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.865 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.165 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.185 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.948 msReply RTT AS13335 · Cloudflare
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.401 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.463 msReply RTT AS13335 · Cloudflare
Before

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.175 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.266 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop6.606 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.683 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.121 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.186 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop0.637 msReply RTT ASN unavailable
During

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.143 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop15.554 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.141 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination0.907 msReply RTT AS13335 · Cloudflare
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.132 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.285 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.148 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.173 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop20.495 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.615 msReply RTT AS13335 · Cloudflare
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
  2. TTL 2 Probe hop0.188 msReply RTT AS8002 · Stealth
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.296 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop2.297 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.315 msReply RTT AS13335 · Cloudflare
After

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 hop0.190 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.222 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.181 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop8.280 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.541 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Destination1.369 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.278 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.201 msReply RTT AS8002 · Stealth
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.142 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.185 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop7.191 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination2.158 msReply RTT AS13335 · Cloudflare
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.115 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.178 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.236 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.174 msReply RTT AS8002 · Stealth
  3. TTL 3 Probe hop1.491 msReply RTT ASN unavailable
  4. TTL 4 Probe hopNo replyNo comparable RTT ASN unavailable
  5. TTL 5 Probe hop1.497 msReply RTT AS13335 · Cloudflare
  6. TTL 6 Probe hopNo replyNo comparable RTT ASN unavailable
  7. TTL 7 Destination1.793 msReply RTT AS13335 · Cloudflare

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
10.131 msAS8002 · Stealth0.121 msAS8002 · StealthSame responder
20.201 msAS8002 · Stealth0.186 msAS8002 · StealthSame responder
30.865 msAS13335 · Cloudflare0.637 msSame responder
TCP traceroute / 443 · Recorded address 2

Before: UTC · During: UTC

Same destination address and probe method. A matching TTL does not establish the same forwarding path.
TTLBefore RTTDuring RTTResponding address
10.175 msAS8002 · Stealth0.148 msAS8002 · StealthSame responder
20.266 msAS8002 · Stealth0.173 msAS8002 · StealthSame responder
3No replyNo replyNot established
4No replyNo replyNot established
56.606 msAS13335 · Cloudflare20.495 msAS13335 · CloudflareDifferent responders
61.683 msAS13335 · CloudflareNo replyNot established
7Not recorded1.615 msAS13335 · CloudflareNot 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.

Latency anomaly. 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.
  • Stored traces were compared using matching source and destination addresses.

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 RTT1.080 msUsual round trip before the event
Last recorded event RTT1.021 msLast successful event recording
Event p95 RTT9.791 ms95th percentile of successful recordings
Change from baseline-0.058 msLast event RTT compared with the baseline
Successful / expected recordings120 / 120Recorded 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