'Azure Logic App - 503 Service Unavailable - Unable to tunnel through proxy

I developed an Azure Logic with an HTTP trigger. The logic app receives a request and then proceeds to do some cool stuff. 99% of the time requests to the logic app are successful however sometimes the calling service receives a response of "Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable" from Azure. When this happens there is no run in the run history of the logic app for me to review.

Does anyone know why this may happen?

Thanks

azureazure-logic-appshttp-status-code-503


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