May I have the proof that it is possible to activate DraftSight under linux with a proxy?

For me, I tried many configurations, but none allow DraftSight to find the activation server, while on a PC with Windows under the same network environment, activation is obtained at once.

Please don't tell me to read the ActivationLicmodelV01.docx that is always given as link with answers concerning licence activation, I already read it many times and it is still open on my desk!

Thank you for your help, I am quite desperate!