{"record":{"id":"a67bd709a30c4d08","repo":"XTLS/Xray-core","slug":"not-a-valid-user","errorCode":null,"errorMessage":"not a valid user","messagePattern":"not a valid user","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"proxy/trojan/server.go","lineNumber":191,"sourceCode":"\tisfb := napfb != nil\n\n\tshouldFallback := false\n\tif firstLen < 58 || first.Byte(56) != '\\r' {\n\t\t// invalid protocol\n\t\terr = errors.New(\"not trojan protocol\")\n\t\tlog.Record(&log.AccessMessage{\n\t\t\tFrom:   conn.RemoteAddr(),\n\t\t\tTo:     \"\",\n\t\t\tStatus: log.AccessRejected,\n\t\t\tReason: err,\n\t\t})\n\n\t\tshouldFallback = true\n\t} else {\n\t\tuser = s.validator.Get(hexString(first.BytesTo(56)))\n\t\tif user == nil {\n\t\t\t// invalid user, let's fallback\n\t\t\terr = errors.New(\"not a valid user\")\n\t\t\tlog.Record(&log.AccessMessage{\n\t\t\t\tFrom:   conn.RemoteAddr(),\n\t\t\t\tTo:     \"\",\n\t\t\t\tStatus: log.AccessRejected,\n\t\t\t\tReason: err,\n\t\t\t})\n\n\t\t\tshouldFallback = true\n\t\t}\n\t}\n\n\tif isfb && shouldFallback {\n\t\treturn s.fallback(ctx, err, sessionPolicy, conn, iConn, napfb, first, firstLen, bufferedReader)\n\t} else if shouldFallback {\n\t\treturn errors.New(\"invalid protocol or invalid user\")\n\t}\n\n\tclientReader := &ConnReader{Reader: bufferedReader}","sourceCodeStart":173,"sourceCodeEnd":209,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/proxy/trojan/server.go#L173-L209","documentation":"Error \"not a valid user\" thrown in XTLS/Xray-core.","triggerScenarios":"Thrown at proxy/trojan/server.go:191 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"7d214f8b094f75322fa3990f8aadad1c912f24f5","analyzedAt":"2026-08-15T14:26:24.325Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}