Hello Howard and Kiersten
We've seen a few of these errors over the past week or so. Our engineering team is investigating. The error itself is an intermittent SSL issue between Workfront services. It's possible that this will occur until a permanent resolution is determined.
Please contact support if the issue persists longer than ~ 10 minutes. Based on log data, it appears that the error is temporary and that scenarios are running as expected after the error occurs.
Typically Fusion error handling should be able to prevent this error from disabling your scenario or causing other problems. If that's not the case, please log a support issue that references your scenario so our team can make recommendations.