For Fixed Licenses (software-based), the local firewall was checked to ensure hasplms.exe was allowed to communicate via localhost. No external firewall rules were required as this is a fixed, local license.
Ansys provides support for replacing faulty physical dongles. Conclusion
I can help you find the current renewal policies or compare the total cost of ownership for both options. Share public link
Fixed licenses come in two primary physical or digital formats: USB Hardkey zemax opticstudio license fixed
This feature would allow a user to "deactivate" a Fixed License remotely via a web portal if the host machine becomes inaccessible.
Thank you for your patience and cooperation.
Use the License Manager on the new machine to "Activate" the license, using the same license number. For Fixed Licenses (software-based), the local firewall was
| Error Message | Fix | | :--- | :--- | | "License server system does not support this feature." | You are using a floating license server file for a fixed license. Re-download the correct node-locked file. | | "Cannot connect to license server (Error -15)" | Your firewall is blocking ZLM. Disable firewall temporarily to test. If works, add exception for port 27000. | | "Security host limit exceeded" | You moved the license too many times. Contact Ansys support to reset the activation count. | | "The desired vendor daemon is down (Error -97)" | The zemax.exe process crashed. Reboot the PC and restart the "Sentinel LDK License Manager" service. |
If using a named-user seat, sign out and back into the portal to refresh your token. Comparison: Old Fixed vs. New Subscription Old Fixed (Perpetual) New Named-User (Subscription) Ownership Perpetual (Own the version) Access-based Portability Physical dongle needed Login credentials Support Optional extra Included in subscription Cost High upfront Lower upfront / Annual OpEx 🚀 Need help with a specific licensing error?
Optical engineers rely heavily on Zemax OpticStudio for lens design, illumination architecture, and laser propagation modeling. Because this software is a critical component of the engineering workflow, a broken or misconfigured license can stall multi-million dollar projects. Conclusion I can help you find the current
If your maintenance expires, you can continue to use the version you currently have, but you cannot upgrade to newer versions or access support services.
With the license fixed, OpticStudio feels renewed—more about solving optical puzzles and less about wrestling tools. Users reclaim time for innovation, validating designs faster and shipping polished systems with confidence.
: A physical USB device that must be plugged into the computer (for Single-User) or the keyserver (for Network).
On Linux (headless):