Enterprise software giant Progress Software on Friday prompted ShareFile customers to shut down Storage Zone Controller servers amid security concerns.

A Storage Zone Controller provides ShareFile customers with private data storage, either on-premises or on a third-party storage system, that is protected with an application-specific password and is self-managed.

On Friday, the company notified customers that it had disabled access to ShareFile accounts using the Storage Zone Controllers and that it is investigating a ‘credible external security threat’.

“We are aware of a credible external security threat targeting Progress ShareFile Storage Zone Controllers,” a message on the company’s forums reads.

Progress also told customers that, as an additional protection measure, they should manually shut down their Storage Zone Controllers.