# \#authentication

**URL:** https://community.dlubal.com/tag/authentication/308.md

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## [Trial authentification – permission for API Service](https://community.dlubal.com/t/trial-authentification-permission-for-api-service/1998)

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**Author:** [@ylesle](https://community.dlubal.com/u/ylesle)\
**Replies:** 26\
**Last updated:** [November 12, 2026, 3:35pm UTC](https://community.dlubal.com/t/trial-authentification-permission-for-api-service/1998 "2026-11-12T15:35:39Z")

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Hello, I try to test gRPC API in a C# project. I'm on trial version. I can't get the RFEM application using my API key : "gRPC Error: UNAUTHENTICATED - API access has been restricted. Your company does not have permissi…

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## [Sharing code with other users](https://community.dlubal.com/t/freigeben-von-code-fur-andere-nutzer/2867)

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**Author:** [@Fabian147](https://community.dlubal.com/u/Fabian147)\
**Replies:** 1\
**Last updated:** [February 16, 2026, 10:25am UTC](https://community.dlubal.com/t/freigeben-von-code-fur-andere-nutzer/2867 "2026-02-16T10:25:48Z")

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I am currently in the process of writing my bachelor's thesis on the development of a Python client for the calculation of timber-concrete composite systems using frame models. For this, I am using the Dlubal API in connec…

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## [Program authorization failed](https://community.dlubal.com/t/autorisierung-des-programms-fehlgeschlagen/2512)

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**Author:** [@HannahLoske](https://community.dlubal.com/u/HannahLoske)\
**Replies:** 3\
**Last updated:** [December 17, 2025, 2:21pm UTC](https://community.dlubal.com/t/autorisierung-des-programms-fehlgeschlagen/2512 "2025-12-17T14:21:57Z")

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I would like to use RStab8. For this, I start the program and load the authorization file. Then I get the message that it worked, after which I have to restart the program. When I restart it…

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## [API key does not work](https://community.dlubal.com/t/grundlegende-nutzung-der-dlubal-api/2439)

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**Author:** [@Ashraf](https://community.dlubal.com/u/Ashraf)\
**Replies:** 3\
**Last updated:** [December 10, 2025, 1:25pm UTC](https://community.dlubal.com/t/grundlegende-nutzung-der-dlubal-api/2439 "2025-12-10T13:25:24Z")

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Hello, I need some help. I copied the code from the examples in the Dlubal library. When I run the code, the following error message appears: . RFEM starts a new model. So the connection works…

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## [API Key is not working](https://community.dlubal.com/t/api-key-is-not-working/2387)

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**Author:** [@studentlnu11](https://community.dlubal.com/u/studentlnu11)\
**Replies:** 10\
**Last updated:** [December 5, 2025, 12:21pm UTC](https://community.dlubal.com/t/api-key-is-not-working/2387 "2025-12-05T12:21:43Z")

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Hello, Im trying to get going with API. I first I tried to create the config.ini with the API key. Then I tried code with KEY directly inside the code. from dlubal.api import RFEM with RFEM.Application(api\_key\_value=…