try to use the last version and follow the instructions and it will work :
Follow below steps to disable the SSL verification:
For Password based Authentication and Remote User based Authentication:
Provide credentials from setup page.
passwords.conf file will be created in TA_cisco-ACI/local folder with sample stanza : [credential:x.x.x.x:,admin,True:].
Here, default value of SSL verification will be True.
Change this value from True to False.
Restart Splunk.
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