Abc, it shouldn't be the game's fault. However, you might want to check your firewall and other security-related settings. There's gotta be a reason for this. In the worst-case scenario, if you cannot run it locally, you should know that War Thunder is also available on GeForce Now. ;)
Released earlier today, the major update that brings War Thunder to version 2.19 includes Chinese helicopters, improved visual effects, scout and strike UAVs, as well as quite a few other pieces of military hardware. The "Drone Age" update also sports new locations and multiple minor tweaks and fixes.