Autodesk Moldflow Error 99998 Full [exclusive] May 2026

Troubleshooting Autodesk Moldflow Error 99998: Solving the "License Not Available" Issue

Few things are more frustrating than setting up a complex simulation only to be met with ** ERROR 99998 ** in your analysis log. This error typically states that a "Required license for AMI_STANDARD (or Premium/Ultimate) is not available".

While it might look like a solver failure, Error 99998 is almost always a licensing communication issue. Here is how to diagnose and fix it. Why is this happening?

The error occurs when the Moldflow Insight solver cannot reach or acquire a license from the server. Common causes include:

Missing Solver License: You may have a license for the UI (Synergy) but not for the solver (Insight).

Incorrect Configuration: The software is looking at the wrong server or using the wrong license level (Standard vs. Ultimate).

Network Timeouts: The request to the license server is taking too long and timing out.

Firewall Blocks: Security software is preventing the solver from communicating with the Network License Manager (LMTools). Step-by-Step Fixes 1. Run the License Configuration Tool

This is the most common fix for Moldflow 2023 and newer versions. Close all Moldflow instances.

Open the License Configuration tool (search "License Configuration 202x" in your Windows Start menu or find mlc.exe in the bin folder).

Ensure the License Mode is set to "Network" and the License Level (Standard, Premium, or Ultimate) matches your subscription. Verify the License Server hostname is correct. 2. Check Server Status in LMTools autodesk moldflow error 99998 full

If you manage your own license server, verify the licenses are actually active. Open LMTools on your server.

Go to the Server Status tab and click Perform Status Inquiry.

Look for feature codes like MFIB, MFIP, or MFIA (representing different Insight levels). If they aren't listed, your license file may be expired or missing the solver component. 3. Increase the FLEXLM Timeout

If your server is on a slow network or VPN, the solver might give up too early. Go to Windows System Environment Variables. Create a new System Variable named FLEXLM_TIMEOUT.

Set the value to 10000000 (10 million, which equals 10 seconds). 4. Clear Rogue Processes

Sometimes a previous crashed analysis "hangs onto" a license.

Open Task Manager and look for processes like flow.exe, cool.exe, or mhb3d.exe.

End these tasks manually to release the license back to the pool. When to Reinstall?

If you've verified the server is fine but the error persists, it may be an installation mismatch. Reinstalling the Autodesk Moldflow Insight License Configuration package specifically often resolves stubborn registry issues without requiring a full software reinstall.

For more detailed technical documentation, visit the official Autodesk Support page for Error 99998. Review analysis settings and adjust them to reduce

In Autodesk Moldflow, Error 99998 typically indicates that the software cannot find or access the required license for the solver

(Insight). This often occurs when the user interface (Synergy) is licensed, but the background solver is blocked, missing a license, or misconfigured. Common Causes License Exhaustion/Expiration

: All available license seats are currently in use by other users, or the license file has expired. Missing Insight License

: The license file contains a license for Synergy (the UI) but lacks the corresponding Insight (solver) license. Connection Blocks

: A firewall or antivirus is blocking the network ports required for license communication (standard ports include 2080 and 27000–27009). Configuration Mismatch

: The wrong product key was used during installation, or there is a mismatch between the installed product level (e.g., Premium) and the available license (e.g., Ultimate). Server Communication Issues

: The client machine cannot resolve the license server's hostname, or the request times out. Recommended Solutions

To resolve the error, try these troubleshooting steps provided by Autodesk Support

Autodesk Moldflow Error 99998 is one of the most dreaded errors in injection molding simulation. It is a "fatal" error that causes the solver to crash immediately, often without generating a results file.

Unlike specific warnings (like "short shot" or "air traps"), Error 99998 is a generic crash code indicating that the solver encountered an unexpected mathematical condition (like dividing by zero) or a memory violation that it could not handle. the crash is hardware-related.

Here is a full review of the causes, diagnostic steps, and solutions for Moldflow Error 99998.

2. Common Causes & Solutions

Solution 4: Optimize Analysis Settings

  1. Review analysis settings and adjust them to reduce computational requirements.
  2. Try running smaller or simpler analyses to see if the error persists.

How to Prevent Error 99998 in Future Analyses

Once you have resolved the error, implement these best practices:

  • Always run from local SSD: Never run Moldflow analyses from a network drive (VPN, Dropbox, OneDrive). The latency and file-locking mechanisms will trigger error 99998.
  • Separate temp and result drives: Set your Moldflow temporary files to a different physical drive than your OS page file.
  • Use the “Run” option “New study” vs “Overwrite”: When launching an analysis, choose “Create new results” instead of overwriting an existing .mfr file.
  • Update to the latest service pack: Autodesk has released fixes for memory buffer handling in Moldflow 2023 and 2024. Check your version (Help > About). Error 99998 is less common in versions 2024.2 and newer.

3. Diagnostic Workflow (How to solve it)

If you encounter Error 99998, follow this step-by-step workflow:

Step 1: Check the "Study Tasks" Log Do not rely on the error popup window. Go to the Study Tasks panel, right-click the analysis run, and select "View Log...".

  • Scroll to the very bottom.
  • Look for the last line printed before the crash. It might say "Calculating filling..." or cite a specific node number. This tells you where in the process the crash happened.

Step 2: Isolate the Problem

  • Change Analysis Sequence: Change the analysis sequence to "Fill Only" (remove Pack, Cool, Warp).
  • Run the analysis.
    • If it crashes: The problem is in the Mesh or Material.
    • If it runs: The mesh is likely fine; the problem is in the Pack/Cool/Warp settings or interactions.

Step 3: The "Dummy" Test

  • Create a new study.
  • Import the geometry again (fresh start).
  • Apply an automatic mesh (default settings).
  • Run with default process settings.
  • If this runs: Your previous mesh was over-optimized or corrupted.

Step 4: Check Memory/Hardware

  • While rare, Error 99998 can occur if your RAM is exhausted (especially in massive 3D models). Check your system RAM usage in Task Manager. If it hits 98% usage during the solve, the crash is hardware-related.

Summary Checklist

| Cause | Likelihood | Fix Priority | |--------|------------|----------------| | Temp drive full | High | 1 | | Too many output steps | High | 2 | | 32-bit solver mode | Medium | 3 | | Antivirus blocking | Medium | 4 | | Corrupt study | Low | 5 | | Path length limit | Low | 6 |

D. Beam Elements (Runners and Cooling)

If your model includes beam elements (runners or cooling channels) connected to 3D Tetrahedral elements:

  • The Issue: If the beam diameter is significantly larger or smaller than the 3D element size at the connection point, the solver struggles to calculate the transition.
  • The Fix: Ensure the mesh density near the gate is fine enough to match the runner diameter.