How To Fix Revit Frozen on Start – License Activation Error with Multiple Autodesk SSO

How To Fix Revit Frozen on Start – License Activation Error with Multiple Autodesk SSO

If you are using more than one Autodesk SSO, you may come across this problem…

  • After a Windows Update or something similar, Revit is not responsive after first launch. Clicking has no effect, but there is no dialog shown either.
  • You may investigate the process details and determine that LMU.exe is thrashing, and you could look at log file in C:ProgramDataFLEXnet and see it growing. You can also observe something like this in the Revit Journal file:
    ‘C 08-Aug-2017 14:53:49.479; 0:< manage licensing
    ‘C 08-Aug-2017 14:54:03.845; 0:< License checkout failed: 20
    ‘C 08-Aug-2017 14:54:03.845; 0:< License cleanup skipped
  • This is telling us there is a licensing problem. In this case, a perpetual license has somehow become deactivated. What is the fix?

You need to login with Autodesk SSO login credentials that have the Perpetual license for that product available…

To do this:

  1. Start Revit Viewer for the same year version that is causing the problem, such as Revit Viewer 2015
  2. Use the top…

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