diff --git a/library/Icinga/Authentication/User/UserBackend.php b/library/Icinga/Authentication/User/UserBackend.php
index 69492aa9c..186cb3679 100644
--- a/library/Icinga/Authentication/User/UserBackend.php
+++ b/library/Icinga/Authentication/User/UserBackend.php
@@ -231,55 +231,4 @@ class UserBackend implements ConfigAwareFactory
         $backend->setName($name);
         return $backend;
     }
-
-    /**
-     * Return whether the given backend is responsible for authenticating the given user (based on their domains)
-     *
-     * @param   UserBackendInterface    $backend
-     * @param   User                    $user
-     *
-     * @return  bool
-     */
-    public static function isBackendResponsibleForUser(UserBackendInterface $backend, User $user)
-    {
-        $backendDomain = static::getBackendDomain($backend);
-        $userDomain = $user->getDomain();
-
-        if ($userDomain === null) {
-            // The user logs in as "jdoe", not as "jdoe@example.com" and there's no default domain.
-            // The backend is only responsible if its domain is also missing.
-            return $backendDomain === null;
-        } else {
-            // The user logs in as "jdoe@example.com" or "jdoe" with a default domain being configured.
-            return strtolower($userDomain) === strtolower($backendDomain);
-        }
-    }
-
-    /**
-     * Get the domain the given backend is responsible for (fall back to the default domain if any)
-     *
-     * @param   UserBackendInterface    $backend
-     *
-     * @return  string|null
-     */
-    public static function getBackendDomain(UserBackendInterface $backend)
-    {
-        $backendDomain = Config::app('authentication')->get($backend->getName(), 'domain');
-        return $backendDomain === null ? Config::app()->get('authentication', 'default_domain') : $backendDomain;
-    }
-
-    /**
-     * Get the user from the given username without its domain and the backend as fully assembled {@link User} object
-     *
-     * @param   string                  $localUsername
-     * @param   UserBackendInterface    $backend
-     *
-     * @return  User
-     */
-    public static function getUserFromBackend($localUsername, UserBackendInterface $backend)
-    {
-        $user = new User($localUsername);
-        $user->setDomain(static::getBackendDomain($backend));
-        return $user->setDefaultDomainIfNeeded();
-    }
 }