Error map
concurrent_requests_limit API Error: Too many concurrent requests (concurrency limit reached)
API · layer 4, Application & API
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)
Cloudflare Error 1015: You are being rate limited
The site’s Cloudflare rate-limiting rule blocked you for sending too many requests in a short time.
API Request Timed Out (ETIMEDOUT / ReadTimeout / timeout of 30000ms exceeded)
The client gave up waiting — either for the connection to open or for the response to arrive.
AWS: ThrottlingException / Rate exceeded
You exceeded the request rate for an AWS API; retry with exponential backoff.
java.util.concurrent.TimeoutException
A Future.get(timeout) or async operation didn’t complete in the allowed time.
Firebase Auth: auth/too-many-requests — Access to this account has been temporarily disabled due to many failed login attempts
Firebase throttled sign-in or SMS verification because of too many attempts from the device/IP or for the account.
Upload error: File too large (LIMIT_FILE_SIZE / file exceeds maximum upload size)
The uploaded file is larger than the limit set by the API, framework or server.
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…
LLM API: overloaded_error (529) / The server is overloaded / Service unavailable — model temporarily overloaded
The provider is temporarily at capacity; the request was rejected even though your key and quota are fine.
Google Maps: This API project is not authorized to use this API / RefererNotAllowedMapError / ApiNotActivatedMapError
The Maps API key isn’t allowed for this site/API — the API isn’t enabled, the referrer restriction doesn’t include your domain, o…
java.util.ConcurrentModificationException
A collection was modified while being iterated (even in a single thread).
S3 SlowDown: Please reduce your request rate (503)
S3 is throttling requests to a prefix because the request rate is above what it can currently serve.
Cosmos DB 429: Request rate is large (TooManyRequests, RU/s exceeded)
The container or database used more Request Units per second than provisioned, so Cosmos DB throttled requests.
Two steps away (33)
HTTP 429 Too Many Requests
You’ve hit a rate limit — too many requests in a given time window. Slow down and retry later.
Cloudflare Error 1020: Access Denied
A Cloudflare firewall/WAF custom rule blocked the request — the visitor’s IP, country, user agent or request pattern matched a bl…
ProvisionedThroughputExceededException: The level of configured provisioned throughput for the table was exceeded
Requests exceed the table’s (or index’s) provisioned read/write capacity, or one partition is hot.
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 408 Request Timeout
The server closed the connection because the client took too long to send the complete request.
HTTP 504 Gateway Timeout
A proxy or gateway waited too long for the upstream server to respond and gave up.
AWS S3: AccessDenied (403) when calling GetObject / PutObject
An IAM policy, bucket policy, ACL/ownership setting, Block Public Access or KMS key policy denied the S3 request.
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.
AWS Lambda: Task timed out after X seconds
The function ran longer than its configured timeout (default 3 seconds) and Lambda stopped it.
HTTP 409 Conflict
The request conflicts with the current state of the resource — e.g. a duplicate or an edit based on an outdated version.
HTTP 499 Client Closed Request (Nginx)
Nginx-specific code logged when the client disconnected before the server finished responding.
Cloudflare Error 522: Connection Timed Out
Cloudflare’s TCP connection to your origin timed out — the origin didn’t answer at all.
toomanyrequests: You have reached your pull rate limit (Docker Hub)
Docker Hub limits anonymous and free pulls; your IP or account has used its quota for the current window.
Google Sign-In: com.google.android.gms.common.api.ApiException: 10 (DEVELOPER_ERROR)
Google Sign-In is misconfigured — the app’s package name or SHA-1/SHA-256 signing fingerprint isn’t registered in Google Cloud/Fi…
IllegalStateException: Default FirebaseApp is not initialized in this process
Firebase couldn’t initialise because google-services.json or the Google Services Gradle plugin is missing/misapplied, or initiali…
HTTP 413 Content Too Large (Request Entity Too Large)
The request body is bigger than the server is willing to accept — usually a file upload over the configured limit.
WordPress: The link you followed has expired
Usually an upload (theme, plugin, media) larger than PHP’s upload/post limits — WordPress receives an empty request and shows thi…
PHP upload error 1: The uploaded file exceeds the upload_max_filesize directive in php.ini
The uploaded file is bigger than PHP’s upload_max_filesize, so PHP discarded it.
HTTP 412 Precondition Failed
A conditional request header (If-Match, If-Unmodified-Since) didn’t match the current state of the resource.
java.lang.InterruptedException (sleep interrupted)
A blocked thread (sleep, wait, join, queue take) was interrupted by another thread.
ERROR: could not serialize access due to concurrent update
A REPEATABLE READ/SERIALIZABLE transaction conflicted with a concurrent one and must be retried.
HTTP 503 Service Unavailable
The server is temporarily unable to handle the request — overloaded, in maintenance, or has no healthy backends.
API Error: Idempotency key reused with different parameters (idempotency_key_in_use)
An Idempotency-Key header was sent again with a different request body, or while the first request with that key was still runnin…
API Error: Job / operation not found or expired (async task ID unknown)
The status URL or job ID for an asynchronous operation (export, import, render, batch) doesn’t exist any more, or never existed.
CORS Error: No 'Access-Control-Allow-Origin' header is present
The browser blocked a cross-origin request because the server’s response didn’t include the CORS headers allowing your site’s ori…
API Error: Invalid API Key / Incorrect API key provided
The API didn’t recognise the key sent with the request — it’s wrong, revoked, from another environment, or sent in the wrong plac…
API Error: Feature not enabled for this account (feature_not_enabled / not available on your plan)
The endpoint or option exists, but your account, plan, region or project hasn’t been granted access to it.
java.lang.NullPointerException
Code called a method or accessed a field on a reference that is `null`.
java.lang.OutOfMemoryError: Java heap space
The JVM ran out of heap memory and garbage collection couldn’t free enough.
java.lang.UnsupportedOperationException (List.of / Arrays.asList is immutable)
Code tried to modify an immutable or fixed-size collection.
AWS S3: NoSuchKey / NoSuchBucket — The specified key/bucket does not exist
S3 found no object at that key (or no bucket with that name in the region/account you’re calling).
BucketAlreadyExists: The requested bucket name is not available
S3 bucket names are global across all AWS accounts, and someone else already uses this one.
AccessControlListNotSupported: The bucket does not allow ACLs
The upload sets an ACL (like public-read), but the bucket uses “Bucket owner enforced” Object Ownership, which disables ACLs.
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