squid3 is denying all http sites

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http://www.linuxquestions.org – Hi All, I had set up trasparent squid proxy using Ubuntu. Everything was working fine but suddenly everyone is getting access deny error since yesterday even I have neither done any changes in squid.conf file nor updated anything and nor blocked any sites. And also replaced squid.conf file from backup which was older than couple of weeks back but still everyone is denying for all http sites including me. But no problem for https and mails, so problem may be from squid. I stoped, started, restarted, reloaded squid service with no errors, though the problem couldn't get rid. I couldn't not find (HowTos)