{"record":{"id":"c90d2203338627e9","repo":"XTLS/Xray-core","slug":"maxidletimeout-must-be-between-4-and-120","errorCode":null,"errorMessage":"MaxIdleTimeout must be between 4 and 120","messagePattern":"MaxIdleTimeout must be between 4 and 120","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"infra/conf/transport_internet.go","lineNumber":273,"sourceCode":"\n\t\t\tif (c.FinalMask.QuicParams.UdpHop.Interval.From != 0 && c.FinalMask.QuicParams.UdpHop.Interval.From < 5) || (c.FinalMask.QuicParams.UdpHop.Interval.To != 0 && c.FinalMask.QuicParams.UdpHop.Interval.To < 5) {\n\t\t\t\treturn nil, errors.New(\"Interval must be at least 5\")\n\t\t\t}\n\n\t\t\tif c.FinalMask.QuicParams.InitStreamReceiveWindow > 0 && c.FinalMask.QuicParams.InitStreamReceiveWindow < 16384 {\n\t\t\t\treturn nil, errors.New(\"InitStreamReceiveWindow must be at least 16384\")\n\t\t\t}\n\t\t\tif c.FinalMask.QuicParams.MaxStreamReceiveWindow > 0 && c.FinalMask.QuicParams.MaxStreamReceiveWindow < 16384 {\n\t\t\t\treturn nil, errors.New(\"MaxStreamReceiveWindow must be at least 16384\")\n\t\t\t}\n\t\t\tif c.FinalMask.QuicParams.InitConnectionReceiveWindow > 0 && c.FinalMask.QuicParams.InitConnectionReceiveWindow < 16384 {\n\t\t\t\treturn nil, errors.New(\"InitConnectionReceiveWindow must be at least 16384\")\n\t\t\t}\n\t\t\tif c.FinalMask.QuicParams.MaxConnectionReceiveWindow > 0 && c.FinalMask.QuicParams.MaxConnectionReceiveWindow < 16384 {\n\t\t\t\treturn nil, errors.New(\"MaxConnectionReceiveWindow must be at least 16384\")\n\t\t\t}\n\t\t\tif c.FinalMask.QuicParams.MaxIdleTimeout != 0 && (c.FinalMask.QuicParams.MaxIdleTimeout < 4 || c.FinalMask.QuicParams.MaxIdleTimeout > 120) {\n\t\t\t\treturn nil, errors.New(\"MaxIdleTimeout must be between 4 and 120\")\n\t\t\t}\n\t\t\tif c.FinalMask.QuicParams.KeepAlivePeriod != 0 && (c.FinalMask.QuicParams.KeepAlivePeriod < 2 || c.FinalMask.QuicParams.KeepAlivePeriod > 60) {\n\t\t\t\treturn nil, errors.New(\"KeepAlivePeriod must be between 2 and 60\")\n\t\t\t}\n\t\t\tif c.FinalMask.QuicParams.MaxIncomingStreams != 0 && c.FinalMask.QuicParams.MaxIncomingStreams < 8 {\n\t\t\t\treturn nil, errors.New(\"MaxIncomingStreams must be at least 8\")\n\t\t\t}\n\n\t\t\tif c.FinalMask.QuicParams.Debug {\n\t\t\t\tos.Setenv(\"HYSTERIA_BBR_DEBUG\", \"true\")\n\t\t\t\tos.Setenv(\"HYSTERIA_BRUTAL_DEBUG\", \"true\")\n\t\t\t}\n\n\t\t\tconfig.QuicParams = &internet.QuicParams{\n\t\t\t\tCongestion: c.FinalMask.QuicParams.Congestion,\n\t\t\t\tBbrProfile: profile,\n\t\t\t\tBrutalUp:   up,\n\t\t\t\tBrutalDown: down,","sourceCodeStart":255,"sourceCodeEnd":291,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/infra/conf/transport_internet.go#L255-L291","documentation":"Range check on finalMask.quicParams.maxIdleTimeout: if set (non-zero) it must be between 4 and 120 inclusive; anything outside is rejected. The unit is seconds per the schema. Values below 4s would drop connections on transient stalls; above 120s keep dead connections too long.","triggerScenarios":"\"quicParams\": { \"maxIdleTimeout\": 2 } or \"maxIdleTimeout\": 300 }.","commonSituations":"Passing milliseconds (e.g. 300000) where seconds are expected; aggressive NAT-friendly tuning below the floor; mirroring TCP keepalive values.","solutions":["Set maxIdleTimeout to a value in [4, 120] seconds (30 is a common choice).","Or remove the field (0) to use the default.","Confirm the unit is seconds, not milliseconds."],"exampleFix":"// before\n\"quicParams\": { \"maxIdleTimeout\": 300000 }\n// after\n\"quicParams\": { \"maxIdleTimeout\": 30 }","handlingStrategy":"validation","validationCode":"func maxIdleTimeoutOK(qp map[string]any) bool {\n    v, ok := qp[\"maxIdleTimeout\"].(float64)\n    return !ok || v == 0 || (v >= 4 && v <= 120)\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Remember the unit is seconds and the window is [4, 120].","Keep keepAlivePeriod < maxIdleTimeout.","Omit the field when the default is acceptable."],"tags":["go","xray","config","quic","timeout","validation"],"backgroundTag":null,"analyzedSha":"7d214f8b094f75322fa3990f8aadad1c912f24f5","analyzedAt":"2026-08-15T14:26:24.325Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}