'Bad MAC' error

Clear a Bad MAC message and get back to taking payments.

It's a security mismatch

A Bad MAC means the secure 'handshake' between your terminal and the bank didn't match. It's almost always cleared with a restart and check-in.

Power-cycle the terminal. As it starts up it logs on to the acquirer again and rebuilds the secure session.

A patchy connection mid-transaction can trigger Bad MAC. Make sure your broadband or signal is stable (see our connection guides).

If a restart doesn't fix it, the security keys may need re-loading. Give us a ring and we'll handle it.

Still need a hand?

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No connection on a Move terminal

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Swapping a terminal battery

Replace the battery in a portable card machine safely.