SYMPTOM:
After completing a project duplication via a 3-tier connection in a clustered Strategy Intelligence Server 9.4.x-10.x environment, the Intelligence Server node the duplication was not executed from becomes unresponsive and the following error is seen when attempting to add it to cluster:

System Error 0x80004005 (2147500037): --- Unspecified error <Server Name>
WORKAROUND:
To prevent this type of behavior from being seen, it is advised to complete project duplication from a 2-tier project source as this alleviates any possible complications which may arise as a result of the Intelligence Server.