intitle:"ERROR: The requested URL could not be retrieved" "While trying to retrieve the URL" "The following error was encountered:"

Google dork Description: intitle:"ERROR: The requested URL could not be retrieved" "While trying to retrieve the URL" "The following error was encountered:"
Google search: intitle:"ERROR: The requested URL could not be retrieved" "While trying to retrieve the URL" "The following error was encountered:"
Submited: 2005-04-27
squid error messages, most likely from reverse proxy servers.