The Kiama Leisure Centre IT network was recently taken offline by Kiama council staff, following a deliberate attack on the network.
The attack occurred early last Friday morning.
Council staff took action and ran their operations for the Leisure Centre manually for a period.
The network has now been restored and business systems are being brought back online.
They were back online as of late Tuesday.
As a precaution, council has recommended customers using direct debit to pay for Leisure Centre memberships and services notify their banks.
Kiama Leisure Centre is in the process of directly contacting these customers.