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working on a ISE migration from 2.3 to 2.7 p1 virtual environment where i did a full backup and restore to the new virtual servers...no issues reported with restore....working to test AAA on a couple switches before migrating the entire environment...
so I do not have a concrete definitive answer on this one as of yet, but we got it working. We submitted a TAC case and they gathered logs and did their things and still waiting to hear back. in order to overcome our issue, we tested authentication...