Open "Services" in Windows, find Autodesk Simulation Compute Manager , and click Restart.

The simulation had run for four hours. It had navigated the intricate gating system, filled the cavity perfectly, and began the packing phase. Then, exactly at 99% completion, the progress bar froze. A heartbeat later, the dreaded dialog box popped up:

: Verify that the necessary inbound and outbound firewall ports for your specific Moldflow version are open on both the client and server.

Troubleshooting Report: Autodesk Moldflow Error 99998 is a critical licensing error in Autodesk Moldflow that occurs when the solver cannot obtain a valid license to run an analysis. It typically indicates that the required license is either missing, currently in use by other users, or incorrectly configured. Core Causes

If you’d like, I can draft a shorter troubleshooting checklist, a template support ticket with required diagnostics, or convert this into a step-by-step printable checklist — which would you prefer?