Unable to clear cache I am facing an severe issue with Drupal instance. I am trying to clear the cache and the page is redirecting to error page.

This site can’t be reached
The connection was reset.
ERR_CONNECTION_RESET

Please help.
Either drush cc or manually truncate cache tables in the db (Backup first!). Unsure if you are running Varnish, but if so you may want to manually flush this as well.