When you know you got licenses…

I know I have 3ds max design licenses, I even checked my FlexLM on my server. It shows I have 50 licenses, but why can’t one of my users start up 3ds max design? When I start the software, I see this message, “The software license check out failed. Error 20.”

I went on a fact-finding mission, checking to see if the workstation actually communicated with the license server. You do this by checking the debug file. If the workstation did try to check out a license, it would leave an entry there. As I expected, there was no entry. I then went back to the workstation and disabled the Windows Firewall. Problem Solved! It turns out that a recent Windows Update actually made the firewall block ports needed by the license server. The fix?

  • Make the few exceptions on the Windows Firewall via GPO,
  • Applied the GPO to my domain,
  • Performed a “gpupdate /force” on the problematic workstation and
  • VOILA!
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