Matt Madore
Ansys Employee

Please refer to this post on the Flexera site:

https://community.flexera.com/t5/FlexNet-Publisher-Knowledge-Base/Receiving-FLEXlm-Error-88-309-System-Clock-Has-Been-Set-Back/ta-p/5825

There must be some file causing the issue.

If problems persist, perhaps there are some third party products which may find and fix these files, you may search for them online, but they should be used with caution and are not endorsed by us.