diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 0d6c25e..934d312 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -239,7 +239,7 @@ function install_state_defaults() {
     // The server URL where the interface translation files can be downloaded.
     // Tokens in the pattern will be replaced by appropriate values for the
     // required translation file.
-    'server_pattern' => 'http://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po',
+    'server_pattern' => 'https://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po',
     // Installation tasks can set this to TRUE to force the page request to
     // end (even if there is no themable output), in the case of an interactive
     // installation. This is needed only rarely; for example, it would be used
diff --git a/core/modules/locale/config/install/locale.settings.yml b/core/modules/locale/config/install/locale.settings.yml
index 857a369..a6cd4f3 100644
--- a/core/modules/locale/config/install/locale.settings.yml
+++ b/core/modules/locale/config/install/locale.settings.yml
@@ -5,7 +5,7 @@ javascript:
 translation:
   use_source: remote_and_local
   default_filename: '%project-%version.%language.po'
-  default_server_pattern: 'http://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po'
+  default_server_pattern: 'https://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po'
   overwrite_customized: false
   overwrite_not_customized: true
   update_interval_days: 0
diff --git a/core/modules/locale/locale.module b/core/modules/locale/locale.module
index b1298e4..9e42448 100644
--- a/core/modules/locale/locale.module
+++ b/core/modules/locale/locale.module
@@ -99,7 +99,7 @@
  *
  * @see locale_translation_default_translation_server().
  */
-const LOCALE_TRANSLATION_DEFAULT_SERVER_PATTERN = 'http://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po';
+const LOCALE_TRANSLATION_DEFAULT_SERVER_PATTERN = 'https://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po';
 
 /**
  * The number of seconds that the translations status entry should be considered.
diff --git a/core/modules/migrate_drupal/tests/fixtures/drupal6.php b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
index 4ca588b..d9b7f95 100644
--- a/core/modules/migrate_drupal/tests/fixtures/drupal6.php
+++ b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
@@ -45250,7 +45250,7 @@
   'name' => 'update',
   'type' => 'module',
   'owner' => '',
-  'status' => '0',
+  'status' => '1',
   'throttle' => '0',
   'bootstrap' => '0',
   'schema_version' => '-1',
diff --git a/core/modules/update/config/schema/update.source.schema.yml b/core/modules/update/config/schema/update.source.schema.yml
new file mode 100644
index 0000000..02777ac
--- /dev/null
+++ b/core/modules/update/config/schema/update.source.schema.yml
@@ -0,0 +1,12 @@
+# Schema for the migration source plugins.
+
+migrate.source.update_settings:
+  type: migrate_source_sql
+  label: 'Drupal update settings'
+  mapping:
+    variables:
+      type: sequence
+      label: 'Variables'
+      sequence:
+        type: string
+        label: 'Variable'
diff --git a/core/modules/update/migration_templates/update_settings.yml b/core/modules/update/migration_templates/update_settings.yml
index a7adfd7..5dcdf29 100644
--- a/core/modules/update/migration_templates/update_settings.yml
+++ b/core/modules/update/migration_templates/update_settings.yml
@@ -4,7 +4,7 @@ migration_tags:
   - Drupal 6
   - Drupal 7
 source:
-  plugin: variable
+  plugin: update_settings
   variables:
     - update_max_fetch_attempts
     - update_fetch_url
diff --git a/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php b/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php
new file mode 100644
index 0000000..27137fd
--- /dev/null
+++ b/core/modules/update/src/Plugin/migrate/source/UpdateSettings.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\update\Plugin\migrate\source;
+
+use Drupal\migrate_drupal\Plugin\migrate\source\Variable;
+
+/**
+ * Update setings source plugin.
+ *
+ * @MigrateSource(
+ *   id = "update_settings",
+ *   source_provider = "update"
+ * )
+ */
+class UpdateSettings extends Variable {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function values() {
+    $values = parent::values();
+    if (empty($values['update_fetch_url']) || strpos($values['update_fetch_url'], 'http://updates.drupal.org/release-history') !== FALSE) {
+      $values['update_fetch_url'] = 'https://updates.drupal.org/release-history';
+    }
+    return $values;
+  }
+
+}
diff --git a/core/modules/update/src/UpdateFetcher.php b/core/modules/update/src/UpdateFetcher.php
index 2b03c9c..d6101b7 100644
--- a/core/modules/update/src/UpdateFetcher.php
+++ b/core/modules/update/src/UpdateFetcher.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\DependencyInjection\DependencySerializationTrait;
+use Drupal\Core\Site\Settings;
 use GuzzleHttp\ClientInterface;
 use GuzzleHttp\Exception\RequestException;
 
@@ -17,7 +18,7 @@ class UpdateFetcher implements UpdateFetcherInterface {
   /**
    * URL to check for updates, if a given project doesn't define its own.
    */
-  const UPDATE_DEFAULT_URL = 'http://updates.drupal.org/release-history';
+  const UPDATE_DEFAULT_URL = 'https://updates.drupal.org/release-history';
 
   /**
    * The fetch url configured in the update settings.
@@ -41,17 +42,27 @@ class UpdateFetcher implements UpdateFetcherInterface {
   protected $httpClient;
 
   /**
+   * Whether to use http fallback if https fails.
+   *
+   * @var bool
+   */
+  protected $withHttpFallback;
+
+  /**
    * Constructs a UpdateFetcher.
    *
    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
    *   The config factory.
    * @param \GuzzleHttp\ClientInterface $http_client
    *   A Guzzle client object.
+   * @param \Drupal\Core\Site\Settings
+   *   The settings instance.
    */
-  public function __construct(ConfigFactoryInterface $config_factory, ClientInterface $http_client) {
+  public function __construct(ConfigFactoryInterface $config_factory, ClientInterface $http_client, Settings $settings) {
     $this->fetchUrl = $config_factory->get('update.settings')->get('fetch.url');
     $this->httpClient = $http_client;
     $this->updateSettings = $config_factory->get('update.settings');
+    $this->withHttpFallback = $settings->get('update_fetch_with_http_fallback', FALSE);
   }
 
   /**
@@ -59,6 +70,25 @@ public function __construct(ConfigFactoryInterface $config_factory, ClientInterf
    */
   public function fetchProjectData(array $project, $site_key = '') {
     $url = $this->buildFetchUrl($project, $site_key);
+    return $this->doRequestWithHTTPFallback($url, ['headers' => ['Accept' => 'text/xml']], $this->withHttpFallback);
+  }
+
+  /**
+   * Applies a GET request with a http fallback.
+   *
+   * This method falls back to http in case there was some certificate
+   * problem.
+   *
+   * @param string $url
+   *   The URL.
+   * @param array $options.
+   *   The guzzle client options.
+   * @param bool $with_http_fallback
+   *   Should the function fall back to http.
+   *
+   * @return string
+   */
+  protected function doRequestWithHTTPFallback($url, array $options, $with_http_fallback) {
     $data = '';
     try {
       $data = (string) $this->httpClient
@@ -67,6 +97,11 @@ public function fetchProjectData(array $project, $site_key = '') {
     }
     catch (RequestException $exception) {
       watchdog_exception('update', $exception);
+
+      if ($with_http_fallback && strpos($exception->getMessage(), 'SSL certificate problem: Invalid') !== FALSE) {
+        $url = str_replace('https://', 'http://', $url);
+        return $this->doRequestWithHTTPFallback($url, $options, FALSE);
+      }
     }
     return $data;
   }
diff --git a/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php b/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php
index aa3563c..ba3144c 100644
--- a/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php
+++ b/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php
@@ -33,7 +33,7 @@ protected function setUp() {
   public function testUpdateSettings() {
     $config = $this->config('update.settings');
     $this->assertIdentical(2, $config->get('fetch.max_attempts'));
-    $this->assertIdentical('http://updates.drupal.org/release-history', $config->get('fetch.url'));
+    $this->assertIdentical('https://updates.drupal.org/release-history', $config->get('fetch.url'));
     $this->assertIdentical('all', $config->get('notification.threshold'));
     $this->assertIdentical([], $config->get('notification.emails'));
     $this->assertIdentical(7, $config->get('check.interval_days'));
diff --git a/core/modules/update/update.services.yml b/core/modules/update/update.services.yml
index fc176d6..cbbd498 100644
--- a/core/modules/update/update.services.yml
+++ b/core/modules/update/update.services.yml
@@ -12,7 +12,7 @@ services:
     arguments: ['@config.factory', '@queue', '@update.fetcher', '@state', '@private_key', '@keyvalue', '@keyvalue.expirable']
   update.fetcher:
     class: Drupal\update\UpdateFetcher
-    arguments: ['@config.factory', '@http_client']
+    arguments: ['@config.factory', '@http_client', '@settings']
   update.root:
     class: SplString
     factory: update.root.factory:get
diff --git a/core/profiles/testing/config/optional/locale.settings.yml b/core/profiles/testing/config/optional/locale.settings.yml
index f1842a0..acdee55 100644
--- a/core/profiles/testing/config/optional/locale.settings.yml
+++ b/core/profiles/testing/config/optional/locale.settings.yml
@@ -4,7 +4,7 @@ javascript:
 translation:
   use_source: remote_and_local
   default_filename: '%project-%version.%language.po'
-  default_server_pattern: 'http://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po'
+  default_server_pattern: 'https://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po'
   overwrite_customized: false
   overwrite_not_customized: true
   update_interval_days: 0