KB: Power Analyzer "Vmesh failed" Error After Windows 11 Upgrade

Solution Details

Users may encounter a “Vmesh failed” error when attempting to run simulations in the Power Analyzer by Keysight after upgrading to Windows 11. The error appears in the simulation log files located in the simulation directory within the project folder. This issue prevents the simulation from starting and may appear without further context.

The root cause was identified as a security-related block on the required executable fem_vmesh.exe

The fem_vmesh.exe file is essential for meshing operations in Power Analyzer. If blocked by antivirus or endpoint protection tools, the simulation will fail to run.

What to Do

• Check Security Software Logs
  Look for any blocked processes related to fem_vmesh.exe in your antivirus or endpoint protection logs.
• Whitelist fem_vmesh.exe
  Request your IT to add fem_vmesh.exe to the whitelist.
• Verify Power Analyzer Functionality
  After whitelisting, restart Altium Designer and rerun the Power Analyzer simulation to confirm resolution.

Additional Notes

• This issue may only appear after upgrading to Windows 11 due to changes in security policies or default configurations.
• The executable is typically located at:
  C:\ProgramData\Altium\Altium Designer {<GUID>}\Extensions\VisualPowerAnalyzerByKeysight\Solver
• If the file is missing, reinstall the Power Analyzer by Keysight extension via Extensions & Updates in Altium Designer.

Further Reading

• Power Analyzer by Keysight – Technical Overview
• Power Analyzer QuickStart Guide
• Power Analyzer Extension Page