How to Relax or Remove the “LocalRequestPartnerRateLimit” Rule in Azure Front Door?

Question

We are hosting a web app on Azure App Service, with traffic routed through Azure Front Door. Most of the time, everything works smoothly. However, we occasionally get a 429 Too Many Requests error, and upon investigation, it appears that a rule named “LocalRequestPartnerRateLimit” in Azure Front Door is causing the block. We want to relax or remove this limitation because it sometimes blocks our normal usage.

Our Front Door WAF policy is currently set to Detection mode, so it should log but not block. We have not set up any custom WAF rules, and we cannot find any configuration related to the “LocalRequestPartnerRateLimit” rule to adjust or disable it. Does anyone know how to loosen or remove this block caused by the LocalRequestPartnerRateLimit rule? Any help would be greatly appreciated.

Answer 1

Hi @西村和海

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

Cause

• Azure Front Door has default platform rate limits. If your traffic exceeds the limit, AFD will start rate limiting the traffic and return 429 responses.

Troubleshooting steps

• If you start seeing 429s for your legitimate traffic and a higher quota limited is need, create an Azure support request.

Refer this link: https://learn.microsoft.com/en-us/azure/frontdoor/troubleshoot-issues#429-responses-from-azure-front-door

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Rohith