Find which process is using a specific port
PS C:\Users\MyUser> $port=8080
PS C:\Users\MyUser> Get-Process -Id (Get-NetTCPConnection -LocalPort $port).OwningProcess
Handles NPM(K) PM(K) WS(K) CPU(s) Id SI ProcessName
------- ------ ----- ----- ------ -- -- -----------
819 61 1005000 577488 58.92 23076 1 java