I didn't knew about enable_marketplace = 0, enable_auto_update = 0, enable_update_communication = 0 .

This could/should be added in the optimization page: http://piwik.org/docs/optimize-how-to/

see also #6348

Here's the list of all outgoing connections I currently identified in Piwik and some settings to modify to stop them:

builds.piwik.org :

• In plugins/CoreUpdater/Updater.php
• Set enable_auto_update = 0

api.piwik.org :

• In core/UpdateCheck.php
• In Set enable_auto_update = 0

plugins.piwik.org :

• In plugins/CorePluginsAdmin/MarketplaceApiClient.php
• In Set enable_marketplace = 0

Transifex :

• In core/Translation/Transifex/API.php
• Call to https://www.transifex.com/api/2/
• Nothing to do

Update spammer blacklist :

• weekly task
• In plugins/CoreAdminHome/Tasks.php
• Call to https://raw.githubusercontent.com/piwik/referrer-spam-blacklist/master/spammers.txt

Update search engines :

• weekly task
• In plugins/Referrers/Tasks.php
• Call to https://raw.githubusercontent.com/piwik/searchengine-and-social-list/master/SearchEngines.yml

Update socials :

• weekly task
• In plugins/Referrers/Tasks.php
• Call to https://raw.githubusercontent.com/piwik/searchengine-and-social-list/master/Socials.yml

Update GeoIP database :

• monthly task
• In plugins/UserCountry/GeoIPAutoUpdater.php
• In plugins/UserCountry/Controller.php
• Call to http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz

Deactivate Feedback plugin
Deactivate ExampleRssWidget plugin
Deactivate SEO plugin
Deactivate MobileMessaging plugin

After those settings, there are still a lot of problems.

enable_marketplace = 0
enable_auto_update = 0
enable_update_communication = 0 

Then i started disabling following plugins (to get piwik working)

• Dashboard
• ExampleAPI
• ExamplePlugin (why those 2 are enabled per default?)
• Feedback
• MobileMessaging
• RssWidget
• SEO
• ProfessionalServices

And there is still for example this request:
https://plugins.piwik.org/api/2.0/plugins?keywords=&purchase_type=paid&query=&sort=lastupdated&release_channel=latest_stable&prefer_stable=1&piwik=3.0.2&php=7.0.9&mysql=5.7.13&num_users=1&num_websites=1'

my workaround for now in Piwik\Plugins\Marketplace\Api\Service::fetch()

public function fetch($action, $params)
{
    $endpoint = sprintf('%s/api/%s/', $this->domain, $this->version);

    $query = Http::buildQuery($params);
    $url   = sprintf('%s%s?%s', $endpoint, $action, $query);

    throw new \Exception($url);
}

Then it does work fastly at least

Side note

## Piwik 2.16.1

### Internal change
 * The setting `[General]enable_marketplace=0/1` was removed, instead the new plugin Marketplace can be disabled/enabled. The updater should automatically migrate an existing setting.

Remaining open tasks after #11465 :

• When disabling internet connection and trying to install a plugin via marketplace the error message currently says You cannot install or update the plugin directly as automatic updates are disabled in the config. To enable automatic updates set '[General]enable_auto_update=1' in 'config/config.ini.php'.
  That might be a bit misleading. Not sure if we maybe should show another message in that case.
• We maybe should hide the ´check for updates´ area in admin, as those check should not work.
• SEO Rankings and Piwik Blog Widgets won't work without internet as well. Should we remove those widgets from the list?

Not sure if we maybe should show another message in that case.

Maybe we could say instead You cannot install or update the plugin directly as all features requiring Internet connection are disabled in the config. To enable connections from your Piwik to the Internet, set '[General]enable_internet_features=1

We maybe should hide the ´check for updates´ area in admin, as those check should not work.

Ideally we'd leave the box there but link instead to http://piwik.org/changelog/ so user can easily see the latest version

SEO Rankings and Piwik Blog Widgets won't work without internet as well. Should we remove those widgets from the list?

Sounds good to remove them from the list 👍

• We need to make sure that when enable_internet_features = 0 then there is no internet connection left in Matomo.

• and document this setting in a new FAQ

With #13076 when internet connection is disabled in config it automatically

• Disallows usage of Marketplace & Mobile Messaging (plugins are forced disabled)
• Disables GeoIP Autoupdate tasks
• Disables GeoLocation Auto Updater UI

Not sure if anything is still missing

@sgiehl did a quick test and looks like the only thing missing is the "check for updates" button. It doesn't fail when internet is disabled, but it does look like it succeeds. Should probably change to link to the matomo.org page w/ the latest version?