It may also be that the ATM system was down - this usually happens to me on Friday mornings.

Another possibility is that you have reached your weekly withdrawal limit overseas. Many banks have a maximum amount they allow customers to withdraw outside the home country - mine is $3000.

A third possibility is that the bank has frozen your card because the activity is "unusual" for your account - happens a lot to people who have never traveled overseas and are using their cards in "flagged" countries for suspicious/fraudulent credit and ATM card use.

Contact your bank - I would suspect it's one of the above situations.
Signature line > "You can't fix stupid"