diff --git a/src/applications/auth/guidance/PhabricatorAuthProvidersGuidanceEngineExtension.php b/src/applications/auth/guidance/PhabricatorAuthProvidersGuidanceEngineExtension.php
--- a/src/applications/auth/guidance/PhabricatorAuthProvidersGuidanceEngineExtension.php
+++ b/src/applications/auth/guidance/PhabricatorAuthProvidersGuidanceEngineExtension.php
@@ -10,6 +10,26 @@
   }
 
   public function generateGuidance(PhabricatorGuidanceContext $context) {
+    $configs = id(new PhabricatorAuthProviderConfigQuery())
+      ->setViewer(PhabricatorUser::getOmnipotentUser())
+      ->withIsEnabled(true)
+      ->execute();
+
+    $allows_registration = false;
+    foreach ($configs as $config) {
+      $provider = $config->getProvider();
+      if ($provider->shouldAllowRegistration()) {
+        $allows_registration = true;
+        break;
+      }
+    }
+
+    // If no provider allows registration, we don't need provide any warnings
+    // about registration being too open.
+    if (!$allows_registration) {
+      return array();
+    }
+
     $domains_key = 'auth.email-domains';
     $domains_link = $this->renderConfigLink($domains_key);
     $domains_value = PhabricatorEnv::getEnvConfig($domains_key);