Am unable to launch game and am given said error.

This is what I've done so far

-Move game to a different drive
-Fully reinstalled
-Ensuring all needed router ports forwarded
-Using a VPN
-Turning off antivirus protection
-clearing all history/cookies/etc from IE
-checked that everything is running as Admin
-Reinstalled game a 2nd time.

Error started randomly this week, no new hardware or changes.
Never had this problem, running game since Launch day.

Thank you for assistance!