Thank you very much for your response. Exactly creating a route policy in my firewall, modifying Squid's installation, and making the NAT in the box Squid is it worked!!! Once again thank you very much for your help. 2013/5/1 Amos Jeffries <squid3@xxxxxxxxxxxxx>: > On 2/05/2013 1:42 a.m., Pablo Ruben M wrote: >> >> I have Squid's new installation 3.3.3 behind a Firewall NAT and do not >> achieve that it works. Placing the debug in ALL, 3 I obtain the >> following mistakes: >> >> HTTP/1.1 400 Bad Request >> Server: squid/3.3.3 >> Mime-Version: 1.0 >> Date: Wed, 01 May 2013 12:19:08 GMT >> Content-Type: text/html >> Content-Length: 3229 >> X-Squid-Error: ERR_INVALID_URL 0 >> Vary: Accept-Language >> Content-Language: en >> X-Cache: MISS from proxy02 >> Via: 1.1 proxy02 (squid/3.3.3) >> Connection: close >> >> In the web browser I obtain: >> >> The following error was encountered while trying to retrieve the URL: / >> >> Invalid URL >> >> I have Squid's installation 2.7 working without problems. Does it >> change radically the installation into Squid 3? > > > No. The changes required to make 3.2and later work are also required to make > version 2.5 to 3.1 work properly. The older versiosn were just hiding the > problem and allowing hackers to use the proxy unrecorded (CVE-2009-0801 is > one of the effects). > > Solution: separate the Squid http_port from intercepted traffic from the > configured proxy traffic. > > > Also, the firewall NAT must be done on the Squid device. If the firewall > device is separate from the Squid device, you require policy routing (or > WCCP) to pass traffic without altering the IP details from the firewall > device to the squid device where NAT can take place. > > Amos > -- Saludos, Pablo R Maldonado