Angular-cli: Port 80 is already in use error.

[johnny-mh]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

    _                      _                 ____ _     ___
   / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
 / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
/_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
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@angular/cli: 1.3.0
node: 6.11.2
os: darwin x64
@angular/common: 4.3.3
@angular/compiler: 4.3.3
@angular/core: 4.3.3
@angular/forms: 4.3.3
@angular/http: 4.3.3
@angular/platform-browser: 4.3.3
@angular/platform-browser-dynamic: 4.3.3
@angular/router: 4.3.3
@angular/cli: 1.3.0
@angular/compiler-cli: 4.3.3

Repro steps.

"serve": {
  "host": "0.0.0.0",
  "port": 80
}

$ ng serve --disable-host-check --e alpha-selleradmin --proxy-config ./proxy/selleradmin.conf.js

The log given by the failure.

Port 80 is already in use. Use '--port' to specify a different port.

Desired functionality.

Server work on 80 port.

Mention any other details that might be useful.

throw Error on angular/cli 's check-port.js module.

I have no process that using 80 port.

$ sudo lsof -t -i tcp:80 -s tcp:listen
// nothing
$ sudo lsof -i ':80'
// nothing
$ sudo lsof -n -i4TCP:$PORT | grep LISTEN
// nothing
$ lsof -n -iTCP:$PORT | grep LISTEN
// nothing
$ lsof -n -i:$PORT | grep LISTEN
// nothing

[johnny-mh]

ports below 1048 needs to root privileges. issue close.

[drewstaylor]

ports below 1048 needs to root privileges. issue close.

Then the error message should be changed to something meaningful please.

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