Accellion Advises Customers to Shut Down Software for Six Hours

Accellion, the enterprise software provider now operating as Kiteworks, has issued urgent guidance instructing customers to shut down its software for a six-hour period.

The instruction, reported on 25 September 2026, requires organisations to take their systems offline for the specified duration. The vendor has not yet disclosed the exact purpose of the shutdown, leaving it unclear whether the downtime is intended for routine maintenance, critical security patching, or responding to a potential security incident.

A six-hour service interruption of this nature typically suggests a high-priority operational requirement. For organisations relying on the platform for secure data transfer and file management, such a window may necessitate adjustments to internal workflows and scheduled tasks.

The company has previously navigated significant security events, including major vulnerabilities involving its File Transfer Appliance (FTA) that resulted in widespread data exposure for various organisations.

Affected entities are advised to follow the specific technical protocols provided by the vendor to ensure the shutdown and subsequent resumption of services are completed securely.