I use free firewall  and i dont open it  .. i pretty sure i dont start it ...
 but when i start my firewall today ,,, it ask me if i allow  this ytdl  or not  ,, and then the ytdl can connect to internet
may be these firewall run in background even i dont start it  ...
yt-dlp 
[youtube] Extracting URL: 
[youtube] MUykHs06-XA: Downloading webpage
[youtube] MUykHs06-XA: Downloading ios player API JSON
[youtube] MUykHs06-XA: Downloading web creator player API JSON
[youtube] MUykHs06-XA: Downloading player 3c3d6e4f
[youtube] MUykHs06-XA: Downloading m3u8 information
[info] MUykHs06-XA: Downloading 1 format(s): 248+251
[download] Destination: The Metal Age (Remastered) [MUykHs06-XA].f248.webm
thank you