Connecting to Exchange through a firewall

[neonetman]

Good morning,

 

Our exchange server is hosted in a datacentre behind a firewall (Sophos UTM). I'm struggling to get Outlook to connect to it correctly without turning the firewall off completely

 

Can anyone offer any ideas of what ports/ranges I need to open to allow it through.

 

I currently have 80, 443, 135, 137, 143, 389, 3268 and 88 opened for it, along with statically assigned ports for the RPC and AB services, yet I'm still unable to connect to it.

[network41]

https://www.winsec.nl/2013/10/11/publishing-exchange-utm-web-application-firewall/

 

Does this help

[neonetman]

Thankyou network41 - thats got me most of the way there now. Only bit I'm still struggling with is that the autodiscover is returning the internal datacenter URL for the exchange server, rather than the external public facing URL.

[network41]

Exchange 2010 Autodiscover InternalURL to External users

 

Quick google found this don't know if it relates directly to your problem, hopefully it will help though

[neonetman]

I think this relates to a problem with autodiscover not working at all (trying to find the config from the wrong URL). My issue is slighly different, in that the autodiscover process works correctly, however the server name it is returning is the internal "exchange.domain.local" address

[network41]

On my Exchange server both the Internal and External URLs are set to the same thing http://mail.NAME.co.uk. This is set on the Server configuration - client access - OWA default. Don't know if this helps. Will do some more digging about when I can