I was trying to unregister CW Applications (LMS2.6) from one of our ACS appliances (4.1) using perl.exe acsregcli.pl -unregister all
but for all applications it says FAILED.
Is there a reason why it is failed?
It could be your ACS admin username as specified in LMS does not have enough access to unregister the applications in ACS. This ACS admin must have all access to all ACS components, and must NOT be the appliance administrator (if this is an appliance).