Activation requests as of 23 May 2018 18:10Z.  The registration check is OK, but the post is NG.

Could the DraftSight/3DS people please find the mid-term mitigation to the activation server problem, eg the tentative monthly offline licenses?

The activation server returns 500 to the activation requests posted to http://www.draftsight.com/webservices/drs_activation.cfc. It is likely this server is implemented as a web application, so 500 is the error by the request handler in general. If the error is caused by the server design, we cannot expect the fix within the reasonable time.