[squid-users] Zyxel USG20 and Squid 3.3

wn48z squid at wizonet.ch
Fri May 22 11:18:37 UTC 2015


Since long time I'm trying to upgrade from Squid 2.7 to 3.x but every 
try has failed up to now.

I use a ZyXel USG 20 firewall with LAN and DMZ Zone. The Squid proxy 
server (MySquid) is running inside the DMZ with a single IP. The Zyxel 
USG 20 has a option for a "HTTP Redirect". This is defined like:

Forward all HTTP Request from LAN to WAN to MySquid Port 3128.

On MySquid, a Squid 2.7 stable version is running with this setting:

http_port 3128 transparent

It works fine - any HTTP requests from LAN goes through the MySquid Proxy.

When I upgrade from 2.7 to 3.3 with some small modifications to the 
default configuration from Squid 3.3:

ACL settings like before
http_Port 3128 intercept

I always get a "null size" / Bad Gateway 502 message in any browser 
inside the LAN for all HTTP internet pages. If I change the setting to:

http_port 3128

(without intercept) and use a manual browser proxy settings 
(MySquid:3128) - the access works through the new proxy server like before.

But that is no option - I can't and will not define manual proxy 
settings for any client in the LAN :(

I can post more detailed informations - debug logs, settings files - 
just ask what you need

Thanks, Martin


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