Resolve API Gateway REST API 403 "Missing Authentication Token" errors

www.repost.aws/knowledge-center/api-gateway-authentication-token-errors
I tried to invoke my Amazon API Gateway REST API and received 403 "Missing Authentication Token" error messages.

How to debug "Missing Authentication Token" in AWS API Gateway?

stackoverflow.com/questions/46072388/how-to-debug-missing-authentication-token-in-aws-api-gateway
I have an API Gateway resource that is proxied to an AWS Lambda function. This worked fine for passing through trailing path parameters (/periodicals/ {tail+}), but as I wanted those parameters to be optional, I also added an ANY method to the higher resource (/periodicals): This works fine when testing that method from within the AWS Console. Directly performing a request on that resource ...

Troubleshoot HTTP 403 errors from API Gateway | AWS re:Post

www.repost.aws/knowledge-center/api-gateway-troubleshoot-403-forbidden
/ Knowledge Center / How do I troubleshoot HTTP 403 errors from API Gateway?

Missing Authentication Token while accessing API Gateway?

stackoverflow.com/questions/39655048/missing-authentication-token-while-accessing-api-gateway
I am trying to call a Lambda Function through AWS API Gateway. When I mention Authentication type NONE it works fine but API become public and anyone with url can access my API. To make API call s...

Set up a gateway response for a REST API using the API Gateway console

docs.aws.amazon.com/apigateway/latest/developerguide/set-up-gateway-response-using-the-console.html
In the preceding header mappings, a static domain name ('a.b.c') is mapped to the Allow-Control-Allow-Origin header to allow CORS access to the API; the input request header of x-amzn-RequestId is mapped to request-id in the response; the petId path variable of the incoming request is mapped to the request-path header in the response; and the q ...

Missing Access Token Error when Access Token Is Included in ... - GitHub

github.com/amzn/selling-partner-api-models/issues/749
I'm attempting to access the Selling Partner API sandbox (https://sandbox.sellingpartnerapi-na.amazon.com) but keep getting a 403. Nothing is returned in the response body, but in one of the response headers it says: x-amzn-errortype | M...

'x-amzn-errortype': 'MissingAuthenticationTokenException','x-cache ...

developer-community.sage.com/topic/101-x-amzn-errortype-missingauthenticationtokenexceptionx-cache-error-from-cloudfront/
Hi, Can someone tell me why I get this message when I try to get an access token : 'x-cache': 'Error from cloudfront', 'x-amzn-errortype ...

How to pass Authentication , Session token and STS temporary ... - GitHub

github.com/amzn/selling-partner-api-models/issues/1394
How to pass Authentication , Session token and STS temporary credentials in reports API Swagger client #1394

MissingAuthenticationTokenException Class | AWS SDK for .NET V3

docs.aws.amazon.com/sdkfornet/v3/apidocs/items/ComputeOptimizer/TMissingAuthenticationTokenException.html
MissingAuthenticationTokenException Class The request must contain either a valid (registered) Amazon Web Services access key ID or X.509 certificate.
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