connection – Err_Connection_Closed on windows 10 when connecting via WIFI

I am taking some courses on udemy and everything was working fine until a few days ago. Now i get an Err_connection_closed when my browser tries to fetch the udemy cdn when loading videos from
This happens only when i am connecting on my windows 10 PC via my home WIFI network on any of my browsers; chrome, firefox and edge.
I am unable to reproduce the issue

  • on any other device on my WIFI network
  • when i connect my own PC to my mobile network instead.

I am able to successfully tracert and ping the url via cmd. i have a d-link router