Last month I was travelling in Croatia.
I was unable to access the Aeroplan website (Canadian air miles plan), the only way to change a flight booked on points.
To be clear, all computers that I tried failed to even go to the log-in site; so it was not a problem with my account.
Some program called Incapsula (?) seemed to be involved.
Access to the site was available in other geographical areas.
Any idea what was going on, if it might happen elsewhere, and how to avoid/circumvent it?