In one drupal instance I run it from debian package using dbconfig-common, thus my database access data are stored in dbconfig.php file and are fetched from settings.php via require_once function.
When trying to access Site Status and Update Sites tabs in multisite_maintenance configuration page I get this message:
Fatal error: require_once() [function.require]: Failed opening required 'dbconfig.php' (include_path='.:/usr/share/php:/usr/share/pear') in /etc/drupal/5/sites/all/modules/multisite_api/multisite_api.module(524) : eval()'d code on line 93
Everything else on the site works. I also checked the access rights to dbconfig.php - nothing wrong there.