Civil 3D 2021 - Blank activation screen

[Traceralexista]

Autocad civil 3d 2021 shows blank activation screen 

[ The subject line of this post has been edited for clarity by @handjonathan Original: Blank activation screen ]

[DarrenP]

is this whats happening?: https://knowledge.autodesk.com/support/civil-3d/learn-explore/caas/sfdcarticles/sfdcarticles/Activat...

or this one:  https://knowledge.autodesk.com/support/civil-3d/learn-explore/caas/sfdcarticles/sfdcarticles/Blank-a...

[mdavis22569]

Check your anti-virus firewall for access

Which URLs/Protocols need to be white listed for Autodesk Subscription Licenses

https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/What-U...

How to set up antivirus (AV) exclusions to improve stability and performance of Autodesk software

https://knowledge.autodesk.com/search-result/caas/sfdcarticles/sfdcarticles/Are-there-antivirus-excl...