Problems with Nmap

hey null-byte hackers,

i have a problem with nmap always if i try to scan a ip no matter with switch i use, it always says: "All 1000 scanned ports on °°°.°°°.°°.°°°are closed" or that thy are all filtered. i used different ip's and searched on the internet but couldn't find any thing usefull. i use kali Linux 2016.2 on virtualbox.

stay frosti

the0badass0pinguin