The file nlm11.18.0.0-ipv4-ipv6-win64.msi is the installer for version 11.18 of the Autodesk Network License Manager (NLM) for 64-bit Windows systems. What is the Network License Manager?
The NLM is a utility used by network administrators to manage software licenses for Autodesk products (such as AutoCAD, Revit, or Maya) within a multi-user environment. It allows a central server to "float" licenses to workstations as needed, rather than assigning a permanent license to each individual computer. Key Features of Version 11.18
Dual Protocol Support: The "ipv4-ipv6" in the filename indicates that the manager supports both IPv4 and IPv6 network protocols. nlm11.18.0.0-ipv4-ipv6-win64.msi
Windows 64-bit Architecture: Specifically designed for modern 64-bit operating systems, including Windows 10, Windows 11, and various versions of Windows Server.
FlexNet Publisher Core: The NLM is built on Revenera's FlexNet Publisher technology. This version includes critical security updates and bug fixes for the licensing service. Installation and Best Practices The file nlm11
Remove Previous Versions: It is highly recommended to uninstall any older versions of the Network License Manager before running this MSI installer.
System Requirements: Ensure your server meets the requirements for Windows 10/11 or Windows Server 2019/2022/2025. Administration & hardening recommendations
Firewall Configuration: Since this manages network traffic, you must ensure that ports 27000-27009 and 2080 are open to allow communication between the client workstations and the license server.
Download Source: Official downloads should always be obtained directly from the Autodesk Network License Manager Support Page to ensure the file is secure and authentic. Autodesk Network License Manager for Windows
C:\Program Files\ANSYS Inc\Shared Files\Licensing\ — recommended for most users.| Issue | Check |
|-------|-------|
| Service fails to start | View Windows Event Viewer → Application logs |
| IPv6 clients cannot connect | Verify ping -6 <hostname> works |
| MSI install fails | Run msiexec /unregister then /register, retry |
| Port conflict | Change PORT in license file and restart service |
| Error | Likely cause | Solution |
|-------|--------------|----------|
| License server system does not support this feature. (-18,147) | IPv6 mismatch – client only IPv4 but license bound to IPv6 hostname. | Use hostname, not IP, in LICENSE_FILE variable or add USE_SERVER option. |
| No such feature exists (-5,414) | Feature name missing or wrong version in .lic file. | Verify feature codes against vendor documentation. |
| Cannot connect to license server (-15,570) | Firewall blocking port 2080. | Add inbound rule for lmgrd.exe and adskflex.exe. |
| Service fails to start | Corrupted install or missing VC++ redistributable. | Reinstall MSI, ensure Visual C++ 2015-2022 x64 is present. |