Exchange Hybrid Mode - MRS Proxy Error

[stebo730]

We are currently trying to setup Exchange Hybrid Mode on Exchange 2013. We have had 6 weeks of calls with Microsoft on this and are no further forward. Essentially when we run the Exchange Hybrid Configuration Wizard it always fails at the last step saying MRS Proxy Failed.

 

We have 2 Exchange Servers both on the latest build of 2013. Both have MRS Proxy enabled on both servers. 1 server is on our internal network and hosts the mailboxes and the other is in the DMZ and is used for Client Access. We get the same error when running the wizard on both servers.

 

Microsoft are wanting to put our internal exchange server directly in the cloud with an external IP address so both Inbound and Outbound traffic can flow to it. We tried to explain we have another exchange in the DMZ but we were not getting anywhere. This has obviously set some alarm bells ringing.

 

Has anyone had any experience of this and is what Microsoft is asking correct or could point us in the right direction.

 

Any help would be most welcome.