Error -15: Cannot connect to license server, followed troubleshooting guide

Question

I am using Mathcad Prime Release 11.0 and Datecode11.0.1.0

Error -15: Cannot connect to license server

I installed FlexNet Admin on a virtual machine and configured it as a PTC licensing server. The license file has been configured, and all required ports have been verified as open.

When launching Mathcad Prime and attempting to connect to the license server, the application reports that the license was added successfully. However, when I check the license settings, the server is not actually listed. If I attempt to add the license server manually, I receive the error:

-15: Cannot connect to license server

I followed the PTC troubleshooting guide for Error -15 but was unable to resolve the issue:
https://www.ptc.com/en/support/creo-admin-troubleshooter/error-code/error-15

Any guidance or suggestions to help resolve this issue would be greatly appreciated. Thank you.

Here are the errors that I faced
-15: Cannot connect to license server.

VladimirN · Answer

Articles:"Error "(-15) Cannot connect to license server system" while launching FLEXnet enabled applications": https://www.ptc.com/en/support/article/CS44661 "Error "-15, Cannot connect to license server" occurs while launching Creo Parametric however, ptcstatus.bat shows correct license status": https://www.ptc.com/en/support/article/CS369588 "Error "-15, Cannot connect to license server" occurs while launching Creo Parametric on same machine where Flexnet Admin License Server is installed": https://www.ptc.com/en/support/article/CS366725

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