Use this consolidated error code index to navigate HTTP, AWS, Azure, and GCP failures from a single technical library. Each entry links to source-backed diagnosis, root-cause patterns, and production-focused remediation steps. Start broad, then drill into provider pages, operational categories, compare guides, or incident playbooks.
62 error codes available
99 error codes available
63 error codes available
22 error codes available
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Amazon EC2 returns `VolumeInUse` when the specified EBS volume is attached to an instance and not in an `available` state for the requested operation.
AWS DeleteConflict means the IAM resource cannot be deleted because subordinate entities are still attached (HTTP 409).
AWS PasswordPolicyViolation means the provided password does not satisfy the active IAM account password policy (HTTP 400).
AWS InvalidViewerCertificate (Cloud Front Invalid Viewer Certificate) means the viewer certificate settings are invalid. In the CloudFront API, this error retur...
AWS DistributionNotDisabled (Cloud Front Distribution Not Disabled) means the distribution must be disabled before it can be deleted. In the CloudFront API, thi...
AWS InvalidKeyPair.NotFound (EC2 Invalid Key Pair Not Found) means the specified key pair does not exist in the selected region.
Amazon EC2 returns `InvalidGroup.NotFound` when the referenced security group ID or name cannot be found in the target VPC scope.
IAM returns `UnmodifiableEntity` when a protected resource, typically a service-linked role, is managed only by the owning AWS service and cannot be changed dir...
CloudFront returns `CNAMEAlreadyExists` when an alternate domain name is already attached to another distribution, so the alias cannot be assigned again. CloudF...
Amazon EC2 returns `InvalidSubnetID.NotFound` when the requested subnet ID cannot be found in the account-region context for the operation.
IAM returns `ConcurrentModification` when overlapping write operations target the same IAM resource at the same time, producing a control-plane conflict. IAM re...
Azure Resource Manager returns `InvalidAuthenticationTokenTenant` when the access token was issued by a tenant that does not match the target subscription tenan...
Azure Resource Manager returns `AuthorizationFailed` when the authenticated principal lacks permission for the requested action at the target scope.
Azure Resource Manager returns `ResourceNotFound` when it cannot locate the requested resource in the active subscription and resource group context.
Azure Storage returns `InvalidAuthenticationInfo` (401) when request authentication details are missing or invalid and the service cannot authenticate the calle...