AWS EC2 instance API: Error "Request failed with status code 451"

Question

My api service was up and running on the ec2 instance but suddenly started throwing error message: {"status":false,"message":"failure","result":{"code":0,"message":"Request failed with status code 451","data":{}},"responseCode":500} while any user trying to re-login. The API is allowing new users to register but not allowing to login back.

I fear is it something https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/451. If yes how can I verify?

Answer

It may have nothing to do with either the website server (hosting) or the client (usually your web browser) but perhaps  internet service provider (ISP) may have blocked the site at a network level or your API/Website may be displaying it . However please do cross check using logs in your AWS resources and also open a support ticket to investigate further.

AWS EC2 instance API: Error "Request failed with status code 451"

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