I tried both with and without HTTPS between the LB and the Exchange servers. The load-balancing is HAProxy with ssl termination on the load-balancer. They are almost non-existant on MAPI over HTTPS but there are a lot of them in EWS (and Autodiscover). There are only problems with Outlook for Mac (EWS), no problem with MAPI over HTTP and other clients.Ī difference I could observe is the number or 4xx errors returned on EWS: I have the same problem but it does only happen with HAProxy in front of the 2 Exchange 2016.
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