Error map
Environment health has transitioned to Severe Elastic Beanstalk: Environment health has transitioned from Ok to Severe
AWS · layer 6, Platform & cloud
Centre: this error. First ring: errors it is linked with (12). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (12)
HTTP 503 Service Unavailable
The server is temporarily unable to handle the request — overloaded, in maintenance, or has no healthy backends.
SES MessageRejected: Email address is not verified. The following identities failed the check in region
SES refused to send because the From address/domain isn’t verified — or the account is still in the SES sandbox, where recipients…
ARM/Bicep: DeploymentFailed / InvalidTemplateDeployment / InvalidTemplate
An Azure Resource Manager (ARM/Bicep/Terraform) deployment failed; the inner error under “details” has the real cause.
HTTP 502 Bad Gateway
A proxy or gateway (Nginx, load balancer, CDN) got an invalid response — or no response — from the upstream server behind it.
deployment "x" exceeded its progress deadline (ProgressDeadlineExceeded)
A rollout didn’t make progress within progressDeadlineSeconds (default 600) — new pods never became ready.
Cloudflare Pages build: Error: Output directory "dist" not found / Failed: build output directory not found
The Pages build finished, but the folder set as “Build output directory” doesn’t exist — the framework wrote its files somewhere…
Azure Functions: No job functions found. Try making your job classes and methods public / Error indexing method
The Functions host started but couldn’t discover or index any functions — wrong project structure, extension/binding problems or…
Stack is in ROLLBACK_COMPLETE state and can not be updated
The stack’s first creation failed and rolled back; a stack in ROLLBACK_COMPLETE can only be deleted, not updated.
ALB target unhealthy: Health checks failed with these codes: [404] / Request timed out
The load balancer’s health checks to your targets fail, so it stops sending traffic (and returns 502/503 if no targets are health…
Multi-Attach error for volume: Volume is already exclusively attached to one node and can't be attached to another
A ReadWriteOnce volume (EBS, Azure Disk, PD) is still attached to another node, so the new pod on a different node can’t use it.
CloudFormation stack in UPDATE_ROLLBACK_FAILED
An update failed, and then the rollback also failed, leaving the stack stuck until you continue the rollback.
The Deployment is invalid: spec.selector: Invalid value: field is immutable
You tried to change a field Kubernetes doesn’t allow to change after creation — Deployment selectors, Job templates, Service clus…
Two steps away (32)
Kubernetes: CrashLoopBackOff
The container starts, crashes (or exits), and Kubernetes keeps restarting it with increasing back-off delays.
HTTP 429 Too Many Requests
You’ve hit a rate limit — too many requests in a given time window. Slow down and retry later.
HTTP 500 Internal Server Error
The server hit an unexpected condition — usually an unhandled exception or misconfiguration in the application.
PHP mail() returns false / emails not delivered
PHP’s mail() function failed or emails never arrive (spam or rejected).
AccessDeniedException: User: arn:aws:iam::... is not authorized to perform: service:Action on resource: ...
The IAM user or role making the call has no permission for that action on that resource — the message names both.
API Gateway {"message": "Internal server error"} 502 — Malformed Lambda proxy response
The Lambda behind an API Gateway proxy integration returned something that isn’t the required {statusCode, headers, body} shape,…
Azure: SkuNotAvailable / QuotaExceeded when creating a VM or resource
The VM size isn’t offered in that region/zone for your subscription, or you’ve hit the vCPU quota.
ResourceGroupNotFound: Resource group 'x' could not be found
The resource group doesn’t exist in the subscription the command or deployment is using.
ResourceNotFound: The Resource 'Microsoft.X/...' under resource group 'y' was not found
The specific resource doesn’t exist in that resource group/subscription — wrong name, group or subscription, or it was deleted.
Error: connect ECONNREFUSED 127.0.0.1:5432
Nothing is listening at that host:port — the target service is down or you’re connecting to the wrong address.
HTTP 407 Proxy Authentication Required
A proxy between you and the server requires credentials before it will forward your request.
HTTP 504 Gateway Timeout
A proxy or gateway waited too long for the upstream server to respond and gave up.
Kubernetes: ImagePullBackOff / ErrImagePull
The node can’t pull the container image — wrong name/tag, missing registry credentials, or registry unreachable.
Readiness probe failed: HTTP probe failed with statuscode: 503 / connect: connection refused
The container is running, but its readiness check fails, so the pod is marked not ready and removed from Service endpoints.
Error: UPGRADE FAILED: another operation (install/upgrade/rollback) is in progress
A previous Helm operation on this release was interrupted and left it in a pending-install/pending-upgrade state, so Helm refuses…
npm ERR! code ELIFECYCLE / Command failed with exit code 1
An npm script (build, start, test, postinstall) exited with an error. ELIFECYCLE is only the wrapper — the real error is printed…
gyp ERR! build error / node-gyp rebuild failed
A dependency with native C/C++ code couldn’t compile — missing build tools, Python, or an unsupported Node version.
COPY failed: file not found in build context / "/app/x": not found
The Dockerfile COPY refers to a path outside the build context, excluded by .dockerignore, or relative to the wrong directory.
Azure App Service: ":( Application Error" / container didn’t respond to HTTP pings
App Service started your app but it crashed or never listened on the expected port.
Azure Functions: Value cannot be null. (Parameter 'connectionString') / Missing value for AzureWebJobsStorage
A Functions app setting or binding connection string is missing — most often AzureWebJobsStorage locally (local.settings.json) or…
Cloudflare Error 1104: A variation of this script was not found (Worker route to deleted script)
A Worker route points to a script that no longer exists (deleted, renamed or not deployed to that environment).
CloudFormation: No updates are to be performed
You ran an update/deploy with a template and parameters identical to what’s deployed, so there’s nothing to change.
CloudFormation: Resource ... already exists (AlreadyExists / already exists in stack)
The template tries to create a resource with a fixed name that already exists — created manually, by another stack, or left over…
ECS: Essential container in task exited (task keeps stopping)
The main (essential) container stopped, so ECS stopped the whole task and the service keeps replacing it.
ACM certificate stuck in Pending validation
ACM is waiting to see the DNS (or email) validation record — it wasn’t created, was created in the wrong DNS zone, or has a typo.
Docker container is unhealthy (health check failing)
The container is running, but its HEALTHCHECK command keeps failing, so Docker (and dependent services) consider it unhealthy.
Azure Storage: AuthorizationPermissionMismatch (403) — This request is not authorized to perform this operation using this permission
You’re accessing blob/queue data with Microsoft Entra ID, but the identity has only management roles (Owner/Contributor) — not a…
QuotaExceededError: Failed to execute 'setItem' on 'Storage': Setting the value exceeded the quota
localStorage/sessionStorage is full (about 5 MB per origin) or storage is disabled.
MySQL ERROR 126 (HY000): Incorrect key file for table; try to repair it
MySQL can’t use a table’s index file — usually a full tmp disk during a query, or MyISAM corruption.
Error from server (AlreadyExists): ... already exists
kubectl create tried to make an object whose name is already taken in that namespace.
strict decoding error: unknown field "spec.template.spec.containers[0].ports[0].protocl"
The manifest contains a field the API schema doesn’t know — a typo, wrong indentation, or a field from another API version.
Operation cannot be fulfilled on deployments.apps "x": the object has been modified; please apply your changes to the latest version and try again
Optimistic-concurrency conflict: the object changed (new resourceVersion) between when you read it and when you tried to update i…
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