Recently I tried to log into an Exchange 2016 console, but after actually typing in my username and password, it gave a blank screen:
This happened when accessing ECP (or OWA) from the Exchange server, any other machine on the network, or even accessing it externally. Upon looking into this, I realised that there was no self-signed certificate for the Exchange server for some reason. There was an SSL cert, but no self-signed cert. This needs to be created, and added to the binding of the ‘Back End’ website within IIS.
Once this was created, and added back into IIS, and the bindings were set, ECP and OWA started to work again.