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Houdini Licenses Just Stopped Working

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Workaround available Windows, macOS, Linux Updated November 14, 2026How we research

Quick answer

Houdini 21 is usually pointed at the wrong license server. Switch the License Administrator back to the server type you originally used (local sesinetd or SideFX login).

Most likely fix: If you originally used your own machine as license server

How to fix it

Try these in order — the most common fix is first.

  1. 1. If you originally used your own machine as license server

    1. Open the License Administrator and use the dropdown in the top-right corner under the login option
    2. Choose 'Switch to on-premise license server (sesinetd)' (older builds up to H21.0.512: 'Use Enterprise Servers')
    3. Click + to move your machine from Found Server(s) to the top section, then click UPDATE
    4. Confirm your machine is the primary license server
    Did this fix it?

  2. 2. If you originally used SideFX login-based licensing

    1. Open the License Administrator and use the same top-right dropdown
    2. Choose 'Switch to Online Licensing (SideFX Login)'
    3. Log in to your SideFX account if prompted
    Did this fix it?

Symptoms

Houdini starts but reports no licenses, although they worked before.

Why it happens

  • Houdini is pointed at the wrong license server
  • Switched between login-based and on-premise licensing

This guide also covers

  • houdini no licenses could be found
  • houdini licenses stopped working
  • houdini license server not found

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