Which process is using port 4000 (identified as remoteanything by nmap)? I've run nmap -sS [computer ip] and see that i only have one service running:

PORT     STATE SERVICE
4000/tcp open  remoteanything


What service is this? Should i close it? I've googled and only found some shady stuff: http://remote-anything.com/ 
Maybe it is used by some of my other programs?
nmap just makes a guess at the service here, as basically any application can bind to any port. To see which specific application it is in your case, run

lsof -i :4000