Running mismatched versions of SPLM on the server and client machines frequently causes protocol conflicts.
before attempting to launch CADWorx, as the software requires an active SPLM-based license to run. Check Firewall Settings cadworx splm error 7502
Some users on dial-up connections or dynamic IPs have successfully resolved error 7502 by installing a Microsoft Loopback Adapter: Running mismatched versions of SPLM on the server