Pense bête Netstat.
Où le port recherché est 81
netstat -aon | find ":81" TCP [::1]:49526 [::1]:81 ESTABLISHED 3060 TCP [::1]:49595 [::1]:81 ESTABLISHED 9348 TCP [::1]:55312 [::1]:81 ESTABLISHED 9348 tasklist | find "3060" Trucbidule.exe 3060 Services 0 44 600 Ko