SDSF not working for some users after z/OS 2.3 migration with TSS 16.0

Document ID : KB000099183
Last Modified Date : 31/05/2018
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Question:
Encountering a problem with SDSF access in z/OS v2.3. Some users are receiving following error:
ISF452E SDSFAUX communications failed, return code 0x00000008, reason code 0x00360806, function "connect". Not authorized for request      
This worked under z/OS v2.1 and we're not running SDSFAUX.
Environment:
z/OS v2.3
Answer:
Only one instance of: ========================================================================================================== 2018/05/29-14:50:37.23 SDSF HSFHCTL 00F51880(00F9) 009F8588 HSF0037W SAF Class SDSF not RACLISTed ========================================================================================================== ...but no other errors found or seen. When you start a 'new' SDSF Task, and you see this warning message, but there are no other errors displayed in the Job Output, then this message can be ignored. It's due to SDSF code can't identify if a Top Secret Rule is resident or not. If SDSF Security isn't enabled on Top Secret (determined from a Top Secret Violation Report), then if you change the SDSF CONNECT parameter to 'AUXSAF(NOFAILRC4)' will prevent this message.