Ensure the specific ports for your Moldflow version are open for inbound and outbound traffic. For example: 2023: TCP 44100, 44200. 2021: TCP 43100, 43200. 2019 and older: TCP/UDP 43911, 42911, 43921.
Remember: Moldflow’s solver stops at Error 99998 to prevent you from trusting a nonsense result. Respect the error, fix the physics, and your simulation (and your part) will converge to success. autodesk moldflow error 99998