Additional uncaught exception thrown while handling exception.

Original

PDOException: SQLSTATE[HY000] [2002] Connection refused in drupal_is_denied() (line 1933 of /home/web/drupal7/includes/bootstrap.inc).

Additional

PDOException: SQLSTATE[HY000] [2002] No such file or directory in dblog_watchdog() (line 147 of /home/web/drupal7/modules/dblog/dblog.module).