If offline_mode is disable, connection is slow but Ok To speed up connection speed, I enable offline_mode and connection is fast. But after 3 days, the following error occurs when accessing some sites... These site are not banned from our ISP If this error occurs, i refresh 3-5 times and works... I do not set any time limit... ERROR: The requested URL could not be retrieved -------------------------------------------------------------------------------- While trying to retrieve the URL: http://z.about.com/d/paranormal/1/0/C/T/mumified_mermaid.jpg The following error was encountered: Access Denied. Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect. Your cache administrator is root. -------------------------------------------------------------------------------- Generated Wed, 20 Aug 2008 06:04:30 GMT by test.abc.net.mm (squid/2.6.STABLE6) So I disable offline_mode again but this error still occurs...