We are using Samsung S2 phones as well as the Samsung Galaxy Tab 10.1
In and out of the offices the phones and tabs are working well to receive / send mail via MS Exchange Active Sync connector.
However, when roaming, even when connected to a "hot-spot" whilst having internet access, users are having difficulty connecting to Exchange mail.
As far as I know Active Sync uses only ports 80 and 443.
I am not sure where else to look for the problem and will appreciate any advice or direction.