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External OWA access not working

I have recently rebuilt my exchange server from scratch everything is working as it should however I cannot seem to get access external access to the OWA page. It was working before the rebuild. I have followed Bobs instructions here: 

https://community.sophos.com/products/unified-threat-management/astaroorg/f/55/t/44114

however this has not work. I have included screen shots of my current settings.

Any help appreciated.


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  • OK so there are multiple places you could be having issues.

    We need your versions - Astaro and Exchange.

    1. I assume you can get to owa from inside the firewall with no problems?
    2. Any certs you need are setup correctly and working - self generated or external provider.
    3. Not getting error messages (other than timeouts)?
    4. Didn't change any IP during this process (yeah, it happens) ?
    4. Try setting your external address to just one IP and test that first.
    5. Can you get to https://remote.domain.com ?