ERROR
The requested URL could not be retrievedWhile trying to retrieve the URL: http://www.mail.ru/
The following error was encountered:
* Socket Failure
The system returned:
(10049) WSAEADDRNOTAVAIL, Cannot assign requested address.
Squid is unable to create a TCP socket, presumably due to excessive load. Please retry your request.
Your cache administrator is webmaster.
Generated Thu, 26 Jun 2003 08:46:11 GMT by silver (squid/2.5.STABLE3-NT-CVS)
смотри свой cache.log
после уточнения ошибки там топай на сайт сквида для расшифровки
http://www.squid-cache.org/Doc/FAQ/FAQ.html