I have exactly the same problem. I am using Outlook 2010 and trying to connect to a Microsoft Exchange Server. If i use my BT landline through my BT HUB5 all i get is 'trying to connect'. However, if I connect via my Mobile (O2) Personal Hot Spot i can connect immediately. this seems to point to the HUB5 firewall or some other BT prevention setting.
I have changed all connection settings on the WiFi and Ethernet adaptors to only use IPV4 but still no joy connecting. I have also connected via a Hotel WiFi with no problem...does anyone have any suggestions?