Azure Search, One or more errors occurred. Unable to connect to the remote server

Question

It is a Cloud Service in Azure working against the Azure Search service. It all works fine but sometimes we get the following exception,

An error occurred while sending the request. Unable to connect to the remote server

Is there a way to trace the problem ?

Answer 1

After discussing with the support of Azure, they claim it was an update they doing every now and then.

Only another replica for the service can make 100% accessibility.