After starting the program as a full version and working with it for a certain period of time, an error message appears saying that the authorization failed when saving the file. What is the cause and how can I save my file anyway?


First information beforehand: If the program was started as a full version, it does not jump into the demo mode if the license cannot be found during the calculation or saving process.
It remains in waiting stage until the license is available again.

It is then necessary to distinguish the type of licensing.
  • Single-user license
  • Network license
For the single-user license, it should be checked if the hardlock was installed on the computer and if the indicator light situated at the end of the dongle is visible. If not, another USB port - preferably directly on the PC - should be used.

In case of a network license, the problem might be caused by a failure in the network connection. In the web-based license user interface http://localhost:1947/_int_/devices.html, it should be checked if the license key is available there.
Additionally, it is possible to look at the http://localhost:1947/_int_/features.html to see if a free license is available for the desired program or add-on module.

If the licensing problem persists, you can create a diagnostic report from the warning message. Send it to our client support.


Warning No. 47 Warning No. 50 Program authorization failed Demo mode Sentinel key not found

Contact us

Contact to Dlubal

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0

RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD
Stand-Alone Timber Structures
RX-TIMBER Glued-Laminated Beam 2.xx

Stand-Alone Program

Timber design of single-span and wide-span glulam beams according to Eurocode 5 or DIN 1052

Price of First License
1,120.00 USD
Stand-Alone Steel Structures

Stand-Alone Program

Design of crane runway girders according to EN 1993-6 and DIN 4132

Price of First License
1,480.00 USD
Cross-Sections Thin-Walled

Cross-Section Properties Software

Section properties, stress analysis, and plastic design of open and closed thin-walled cross-sections

Price of First License
1,120.00 USD