A nagging screen from AutoCAD 2018 suddenly appeared after using it for 3 years.

Today I encountered a nagging screen from AutoCAD 2018 telling me that my AutoCAD license is invalid. It appears every few minutes. You can close it and continue using the software freely but the nagging dialog is getting annoying.

I downloaded it from rutracker years ago. No nagging screen appeared until today.

Does anyone know how I can fix this? I already added a rule in the Firewall settings to block connections.

Apologies if my wordings are bad, English is not my native language. Also, I'm not savvy about these stuff so please bear with me, thank you.

EDIT: added the version of AutoCAD to the title and body.

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5 comments

Funnily enough we got this message even in enterprise environment, where licenses were paid (and damn they are expensive). I’m convinced it’s just some process in the software itself. Have you tried looking through every process? Gotta find that one file that starts this pop-up and block it. I think that’s why your firewall rule didn’t help.
- Thanks. I didn't go through every process carefully; just skimmed through them, but I saw one process about Licensing manager or something. Went through it's directory folder and found an xml file which contains the words "autocad". I assumed it was the one 'causing it so I killed the process but unofortunately, it didn't do a thing.
  I apologize for the lack of info, I'm on mobile atm and have no access to my pc yet.
  Were you able to stop the nagging on your side?
  
  There were many meetings with Autodesk about this. Unfortunately, I didn’t attend these. I believe it had something to do with a subnet change in the internal network. So the license server wouldn’t recognize the new endpoints. However, since yours is unlicensed I’m not sure if this would help you. Have you tried disconnecting from the internet completely? Does that make a difference?
  I think your best bets are blocking a process (started from a file) or a network route. For the latter you can try WireShark to monitor every network route.
  
  Just an update. I did a google search and found that it was the program/process called AcWebBrowser.exe so I created an outbound rule for the program and the nagging screen finally stopped.
  
  I love seeing closure and the actual solution posted. Too many times I've searched forums only to be met with "Nevermind, I figured it out." - Posted 2 years ago by a deleted account*