This article provides a potential solution for an issue while configuring MCS profiles via the Operator Console in DX UIM 20.3.
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The security.cfg file contains all security data: users, passwords, ACLs and probe permissions.
All hubs have a security.cfg file and all hubs sync to the highest version number.
Due to a security.cfg file corruption this resulted in an MCS error in the Operator Console.
Use the following KB to recover the security.cfg and then re-test the MCS scenario.
UIM - Use the secedit utility to recover or modify the security.cfg