Hello!
Have issue with export in Rhino 8 as well with 8081 error
And in Options in RFEM i have only Dlubal API without Webservice being available
RFEM 6 version: 6.14.0002
Dlubal Rhino Plugin: 8.612.12.1
What can I do to fix this?
Tried changing port, still not working
Hi Petrucho,
Welcome to the community! 
The Grasshopper Interface is based on Webservice (SOAP).
So you have to activate the following setting:
This setting is not visible in your picture. Seems like you are running the demo license.
Please make sure to change to your current student license:
https://www.dlubal.com/en/support-and-learning/support/faq/005334
Best regards
Paul Sivolgin