Enabling External Outlook Web Access to On-Premises Exchange Server

I'm trying to enable external Outlook Web Access (OWA) to an on-premises Exchange Server 2013.

OWA works fine on the internal network and mail.[mycompany.com]/owa is correctly enabled on the server.

However, I just can't get external access to work.

The server is connected to the internet via BT Business Hub with the firewall disabled and
port 443 forwarded to the external interface of Watchguard Firebox T15.

I've set up an SNAT from all external on port 443 to the internal IP address of the Exchange Server. I've then created a new HTTPS policy with a proxy to allow the appropriate traffic but I just can't get it to work.

The firewall policies arehttps://drive.google.com/file/d/1yqZexDDKdwxmzp9nrXx_8wlhvixXLP4h/view?usp=sharing

The policy details are https://drive.google.com/file/d/1o__9PP9BgD4Xh3YcRbyJkxgtZtnx3afj/view?usp=sharing

and the proxy details are https://drive.google.com/file/d/1BhEl4xqO9XgZec9SSKkexa-atjvXan6x/view?usp=sharing




  • Options

    Turn on Logging on your policy and proxy action so that you can see what is being allowed in Traffic Monitor.
    If you don't see anything, then look again at the BT Business Hub setup.

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