Cannot be downloaded anymore

[freelancerwebro]

I run the installing command with composer, and I receive the following message:

`Loading composer repositories with package information
The "https://packagist.org/packages.json" file could not be downloaded: failed to open stream: No route to host
https://packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date
Updating dependencies (including require-dev)

Installation failed, reverting ./composer.json to its original content.

[Composer\Downloader\TransportException]
The "http://packagist.org/p/stecman/symfony-console-completion%24516d714c4e9791d138daf769ca0466a287e67ece4bf010549e55ef3a2dd0237f.json" file could not be downloaded: failed t
o open stream: No route to host
`

[WhiteSnowGirl]

cannot be down?

[WhiteSnowGirl]

php ../composer.phar require --prefer-dist garyjl/yii2-simple_html_dom "dev-master"