I have a windows 2008 with exchange server 2010. When I am over the office LAN, the outlook works fine. When I am at home and try to connect my outlook to the exchange server, over the internet, i get this message: 0x8004011D The server is not available. Contact your administrator if this condition persists.
I have a Cisco root and I have open ports: 25, 53, 80, 88, 135, 443, 389 TCP/UDP.
PS: My iPhone connects perfect with the server.