In ENS configuration guide it says that you must upgrade your CNS from CNS v1.0 to CNS v2.0 for supporting notifications.
Is there any procedure how to upgrade CNS to v2? Also, is it possible to check current CNS version in Workplace One console (om-prem)?
I am having the same problem.
The SEG server is not proxying the https:\\seg.bla.nl\EWS\Exchange.asmx correct.
Using the ews editor to check this I am getting:
The request failed. The remote server returned an error: (400) Bad Request.
So the seg is not handling that correctly. I am running the latest version of seg and ENS(220.127.116.11)
But this is more a SEG problem than a ENS problem.
What I did found was editing the hostfile on de ENS server pointing it to the internal address of the exchange server made it work on one occasion.
I will try to update this after some more testing.