SSO is breaking from R12.52 and R12.0.

Document ID : KB000006242
Last Modified Date : 14/02/2018
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Issue:

Portal application got migrated to R12.52 and some of the Siteminder protected applications are accessed from portal application and they are residing on the R12.0 policy servers and sso is breaking from R12.52 and R12.0.

Resolution:

A 12.52 Agent will not work with a 12.0 Policy Server, but a 12.0 will work with a 12.52 Policy Server.