Issue: You cannot register an EPM System product with Shared Services when the product and Shared Services are on different machines. This message is logged in SharedServices_security.log:
com.hyperion.interop.lib.OperationFailedException: Unable to Authenticate
Solution:
Verify that the administrator's password for Shared Services is correct.
Subscribe to any online time source that uses an atomic clock, and ensure that both machines use this time source so that they are synchronized.