I'm setting up an Exchange 2010 infrastructure, and am in the lucky situation of having four Exchange servers. My company has a single domain and one site. Two of the servers are running the Client Access Server and Hub Transport roles, and the other two servers are running the Mailbox roles and a DAG. I'm using Windows Network Load Balancing on the first two servers and a CAS array. Connecting to https://mail.domain
name/owa works fine internally, but I can't get it to work when connecting from an external network - the OWA login page won't display. I've checked the firewall settings, and been in touch with the firewall provider who has confirmed that the packets are correctly being forwarded to the CAS array.
Can anyone help?