Autodesk software slow to acquire network license

Bored waiting?

Problem: Your network (or “multi-user”) license of Autodesk software is slow to acquire a license when starting, especially after changing the license server.

Cause: Over time, the licenses server name(s) are recorded in the Windows registry of the CAD workstation in the registry key ADSKFLEX_LICENSE_FILE located here: HKEY_CURRENT_USER\SOFTWARE\FLEXlm License Manager

The troublesome application appears to test each entry on this registry key for a license, waits for the timeout period, and moves on to the next entry on the list.

The motivation for this post was a 45 second start-up time for Inventor – now it’s 10s.


Solution: Looking at the contents of the key, you will see a list of the license servers that have been used in the past, or maybe a path or two to some obscure folder relating to a product long since removed.  Really you only need the current license manager server name – or even better, leave it blank if you only have one license manager.

After deleting all the text in the key (except your current license manager name if you need it), your software should open as quickly as you expect it to.

Note: Do not edit the Windows registry unless you are confident about doing so. I have deliberately NOT provided step-by-step instructions for this reason.  Users familiar with the Windows registry will be able to find and fix this issue with the information provided above.

Changes made to the Windows registry happen immediately, and no backup is automatically made.  Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to re-install Windows to correct them.  We cannot guarantee that any problems resulting from the use of Registry Editor can be solved.  Use this tool at your own risk.  

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