{"record":{"id":"e64beeb5fadf9aba","repo":"GyulyVGC/sniffnet","slug":"no-reply","errorCode":null,"errorMessage":"No reply","messagePattern":"No reply","errorType":"exception","errorClass":"LatencyStatus::Failed","httpStatus":null,"severity":"info","filePath":"src/networking/types/latency.rs","lineNumber":50,"sourceCode":"    let mut sum = Duration::ZERO;\n    let mut received: u32 = 0;\n    let mut last_error = None;\n    for _ in 0..PING_COUNT {\n        match pinger.ping(next_sequence(), &PING_PAYLOAD).await {\n            Ok((_, latency)) => {\n                sum += latency;\n                received += 1;\n            }\n            Err(error @ SurgeError::Timeout { .. }) => last_error = Some(error.to_string()),\n            Err(error) => {\n                last_error = Some(error.to_string());\n                break;\n            }\n        }\n    }\n\n    match received {\n        0 => LatencyStatus::Failed(last_error.unwrap_or_else(|| \"No reply\".to_string())),\n        n => LatencyStatus::Measured(sum / n),\n    }\n}\n\nfn client_for(ip: IpAddr) -> Result<Arc<Client>, String> {\n    let (cell, kind) = match ip {\n        IpAddr::V4(_) => (&IPV4_CLIENT, ICMP::V4),\n        IpAddr::V6(_) => (&IPV6_CLIENT, ICMP::V6),\n    };\n\n    if let Some(client) = cell.get() {\n        return Ok(Arc::clone(client));\n    }\n\n    let client = latency_client(kind)?;\n    Ok(Arc::clone(cell.get_or_init(|| client)))\n}\n","sourceCodeStart":32,"sourceCodeEnd":68,"githubUrl":"https://github.com/GyulyVGC/sniffnet/blob/48b0575dc0d3c7e503a466a3cb2c1466ba600f8e/src/networking/types/latency.rs#L32-L68","documentation":"In measure_latency (src/networking/types/latency.rs:50), after sending PING_COUNT probes, if zero replies were received the function builds LatencyStatus::Failed from the last recorded error, defaulting to the literal 'No reply' via unwrap_or_else when last_error is None. Each loop iteration records SurgeError::Timeout or breaks on other errors, so 'No reply' is the defensive fallback meaning: every ping attempt failed without a captured error message (e.g. PING_COUNT iterations produced no reply and no stored error), and no RTT value can be shown.","triggerScenarios":"All probes to a host are lost: destination drops ICMP echo (firewalled), intermediate network filters ICMP, host is offline/unroutable — normally these surface as Timeout strings carried in last_error; 'No reply' itself appears when the loop completed with received == 0 and last_error stayed None, e.g. zero-iteration edge cases or errors not recorded. Result: the latency column renders the Failed text ('No reply' or the last surge error).","commonSituations":"Pinging Windows hosts (ICMP often filtered), cloud servers behind security groups denying ICMP, pinging during connection loss/airplane mode, DNS-resolved IPv6 targets on an IPv4-only network, hosts that rate-limit ICMP; also all-Timeout runs where the displayed text is the surge Timeout message rather than 'No reply' — same Failed state.","solutions":["Verify the host answers ICMP at all: `ping <ip>` from a terminal — if that also fails, the latency column can never show a value (firewall/host policy), which is expected behavior.","Allow ICMP echo request/reply in the remote host firewall or cloud security group if you control it.","Check local connectivity/routing first (default route present, VPN split tunnel excluding the target).","Retry after network changes — the status is per measurement, later attempts can succeed; timeouts are capped by PING_TIMEOUT.","If every host shows Failed including 8.8.8.8, suspect local privileges/firewall instead (see error 10) or an OS-level ICMP block."],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":"// Failed('No reply'/Timeout) is informational — degrade gracefully\nmatch measure_latency(ip).await {\n    LatencyStatus::Measured(d) => render(d),\n    LatencyStatus::Failed(reason) => render_dash_with_tooltip(reason), // don't retry automatically\n    LatencyStatus::Measuring => render_spinner(),\n}","preventionTips":["Accept that ICMP-filtered hosts (Windows defaults, strict cloud security groups) will never answer — don't retry-loop them.","Sanity-check with `ping <host>` before assuming Sniffnet's latency feature is broken.","Compare against a known-good target (8.8.8.8): if that also fails, suspect local privileges/firewall, not the host.","Remember timeouts are bounded by PING_TIMEOUT and PING_COUNT — a Failed result is final for that measurement round."],"tags":["rust","sniffnet","icmp","ping","timeout","firewall","latency"],"backgroundTag":null,"analyzedSha":"48b0575dc0d3c7e503a466a3cb2c1466ba600f8e","analyzedAt":"2026-08-16T09:14:10.427Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}