A software patch was supplied from the vendor to correct an existing problem. This patch caused the SCADA server to fail, stopping the entire system. Operations of 3 plants were carried out on the one working PC, a standalone backup PC that had yet to be patched.
The system was restore to full operation by inserting a hard disk that was removed from the server prior to the patch being installed, this was the first time that the disk had been removed.
The software re-issued the patch with revised instructions detailing it was not to be used on the SCADA server.
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