DNS アドレス（Cloud Run など）を使用してメッセージを Google の宛先に転送するパイプラインで HTTP 503 Service Unavailable エラーが発生した場合は、ネットワーク アタッチメントで使用されるサブネットで限定公開の Google アクセスが有効になっていることを確認してください。有効になっていないと、DNS アドレスを解決できません。
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-04 UTC。"],[[["\u003cp\u003eEventarc Advanced is a pre-GA feature, subject to specific terms and with limited support.\u003c/p\u003e\n"],["\u003cp\u003eHTTP \u003ccode\u003e503 Service Unavailable\u003c/code\u003e errors can occur if Private Google Access is not enabled on the subnet when routing messages to Google destinations using a DNS address.\u003c/p\u003e\n"],["\u003cp\u003eCustomer-managed encryption key (CMEK) issues, such as disabled keys, exceeded quotas, mismatched regions, or organization policy constraints, can impact Eventarc resources, and the solutions are detailed.\u003c/p\u003e\n"],["\u003cp\u003eDuring event delivery, CMEK-related issues, like disabled keys, exceeded quotas, or permission errors, can occur, each with specific troubleshooting steps.\u003c/p\u003e\n"],["\u003cp\u003eFor issues with externally managed keys via Cloud External Key Manager (Cloud EKM), refer to the Cloud EKM error reference for guidance.\u003c/p\u003e\n"]]],[],null,["# Troubleshoot issues\n\n[Advanced](/eventarc/advanced/docs/overview)\n\nThis page shows you how to resolve issues that you might encounter when using\nEventarc Advanced.\n\nHTTP `503 Service Unavailable` errors\n-------------------------------------\n\nIf you encounter an HTTP `503 Service Unavailable` error for a pipeline that\nroutes messages to a Google destination using a DNS address---for example,\nCloud Run---make sure that\n[Private Google Access](/vpc/docs/private-google-access) is enabled on the\nsubnet used in the network attachment; otherwise, the DNS address can't be\nresolved.\n\nCMEK issues\n-----------\n\nYou can [use customer-managed encryption keys (CMEK)](/eventarc/advanced/docs/use-cmek) to protect Eventarc. The keys are created and managed through Cloud Key Management Service (Cloud KMS). The following table describes different CMEK issues and how to resolve them when using Cloud KMS with Eventarc.\n\n\u003cbr /\u003e\n\n### Issues that occur when creating or updating Eventarc resources\n\n### Issues that occur during event delivery\n\nTo resolve issues that you might encounter when using externally managed keys\nthrough Cloud External Key Manager (Cloud EKM), see\n[Cloud EKM error reference](/kms/docs/reference/ekm_errors).\n\nWhat's next\n-----------\n\n- [Retry events](/eventarc/advanced/docs/retry-events)\n- [View audit logs](/eventarc/advanced/docs/audit-logs)"]]
