If you intend to run Composer without connecting to the internet, run the command again prefixed with COMPOSER_DISABLE_NETWORK=1

Problem:

A connection timeout was encountered. If you intend to run Composer without connecting to the internet, run the command again prefixed with COMPOSER_DISABLE_NETWORK=1 to make Composer run in offline mode.
https://packages.drupal.org/8 could not be fully loaded (curl error 28 while downloading https://packages.drupal.org/8/packages.json: Resolving timed out after 10000 milliseconds), package information was loaded from the local cache and may be out of date

Solution?