Sigma - IDM integration fails on view sigma group tasks

Document ID : KB000103308
Last Modified Date : 28/06/2018
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Issue:
Identity Manager and Identity Portal Integration is working and connecting however when we attempt to run the "SigmaViewGroupTask" It is failing with a Authentication error. 
Environment:
Identity Portal 1.6.1
Resolution:
We were able to resolve this by leaving SSO enabled. Without it enabled it was failing with authentication. Please see the error below.

14:08:59,543 ERROR [com.idmlogic.sigma.connector.ca.CaimAdapter] (http-/0.0.0.0:8080-2) An error happened in fetching group objects, therefor the connector won’t be able to get target permissions of type group.To correct the problem check the CAIM Admin credentials in the connector definition.: ErrorCode: 0, errorFmaily: GENERAL, Message: ErrorCode: 0, errorFamily: GENERAL, Message: com.idmlogic.sigma.connector.ca.tews.IMException: Not Authenticated