As of Friday evening, I've been unable to access Workfront through web browser (Chrome, Firefox, or Safari) or through iPhone app. Keep getting a "This site can’t be reached" type of error (ERR_CONNECTION_RESET). An Associate of mine is experiencing the same issues.
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So sorry to hear this! Have you been able to get this resolved? It sounds like this will need a support ticket to be able to troubleshoot your specific browser/computer, etc.