Connection interruption in proxylocal?

Question

linux

Hello.
When I enter the command proxylocal 80in proxylocal I get: Connection has been terminated
This is how I scan the local web host nmap denant.loc. Result -

Starting Nmap 6.40 ( http://nmap.org ) at 2015-09-23 22:33 FET
Nmap scan report for denant.loc (127.0.0.1)
Host is up (0.000010s latency).
rDNS record for 127.0.0.1: localhost
Not shown: 998 closed ports
PORT   STATE SERVICE
25/tcp open  smtp
80/tcp open  http

What causes the connection to drop?
Thanks in advance.