If you configure MobileSiteAccessURL to use a siteaccess passed trough URI, the redirection will fail and end up with "module not found" error.

This bug seems to happen because

// ezpublish_legacy/kernel/private/classes/ezpmobiledeviceregexpfilter.php
// Line 121
        if ( !isset( $_COOKIE['eZMobileDeviceDetect'] )
                && !in_array( $currentSiteAccess['name'], eZINI::instance()->variable( 'SiteAccessSettings', 'MobileSiteAccessList'  ) ) )
        {
            $http->redirect( eZINI::instance()->variable( 'SiteAccessSettings', 'MobileSiteAccessURL' ) . eZSys::serverVariable(  'REQUEST_URI' ) 

eZ Publish will append eZSys::serverVariable( 'REQUEST_URI' ) at the end of MobileSiteAccessURL ignoring if among the REQUEST_URI is the siteaccess.

Steps to reproduce

1. Configure site.ini.append.php of override with the following settings

   [SiteSettings]
   DefaultAccess=eng
   

2. Configure site.ini.append.php of eng siteaccess with the following settings

   [SiteAccessSettings]
   DetectMobileDevice=enabled
   MobileSiteAccessURL=http://your-domain.com/iphone
   

3. Open http://your-domain.com in your browser (from a mobile device) and confirm that you will end up in the correct mobile address: http://your-domain.com/iphone
4. Now open your url with a siteaccess, in this case I'll use the default one eng: http://your-domain.com/eng
5. If the bug is present, you will see the siteaccess uri part following the mobile siteaccess after the redirect: http://your-domain.com/iphone/eng.