Default [Q] Trouble with DNS on local network (Jump Desktop & VLC Remote)

im having trouble with the dns on a couple of apps that i use. jump desktop, and vlc remote

i have 2 other pc's on my home network. pc-1 and pc-2. all apps connect to pc-2 without any problems. only es file explorer will connect to pc-1. jump, and vlc both act like the pc isn't there or that something is blocking it from connecting. all apps were working fine a week ago

pings, and nslookup from terminal emulator displays the correct information

is there a way to reset the dns for the entire os? or does anyone know a fix for this?