Mortgage technology developer Ellie Mae has suffered a series of outages and service disruptions, likely caused by a denial-of-service attack, that have delayed loan closings and left workers idle at quarter's end, a critical time for lenders.

The attack began as early as Sunday, but caused the most disruption on Monday and Tuesday, according to lender users of the self-hosted and software-as-a-service versions of Ellie Mae's Encompass loan origination system.

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