Hey Bastien,
I have seen this problem couple times being caused by wrong MTU used by
some points in the network Infrastructure,
Try to make sure another application other then squid has a success
while fetching the url.
try to find out the path MTU.
if you are not sure about it you can try the manual way by using ping
with a specific size and calculate manually the PMTU to a specific node\IP.
I had a small script which was pretty nice to do the trick couple times at:
http://rcl-rs-vvg.blogspot.co.il/2011/09/discovering-largest-supported-mtu.html
and nmap also has a nice script for that:
nmap --script path-mtu www.example.com
By the way what OS are you using squid on?
Regards,
Eliezer
On 1/17/2013 8:47 AM, Amos Jeffries wrote:
On 17/01/2013 5:35 a.m., Bastien Ceriani wrote:
Hi,
We use Squid 3.1.20.
Firstly please upgrade this Squid if possible. 3.1 series is outdated
and up to a .23 release now anyway due to security bugs. Current Squid
release is 3.2.6.
We are often exposed to a problem which return a "Zero Sized Error".
Can i fix it with some options on the squid configuration file ?
It depends on why "the server is not sending any information back to
Squid". If you can determine what type of HTTP requests *do* get a
response from this server and how they differ from what is being relayed
by your Squid you have a chance at discovering what settings might make
it work.
I tried all of things mentioned after :
- Delete or rename your cookie file and configure your browser to
prompt you before accepting any new cookies.
- Disable HTTP persistent connections with the
server_persistent_connections and client_persistent_connections
directives.
- Disable any advanced TCP features on the Squid system. Disable ECN
on Linux with echo 0 > /proc/sys/net/ipv4/tcp_ecn/.
I will try to find the origin of the problem with a tcpdump on my
proxy my i don't known how could i exploit it.
This is the result of the TCP stream between my proxy and the website :
GET / HTTP/1.1
Host: www.mopub.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101
Firefox/17.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Via: 1.1 localhost (squid/3.1.20)
X-Forwarded-For: 192.168.1.137
Cache-Control: max-age=259200
Connection: keep-alive
As you can see. NO reply.
And between the proxy and the client :
GET http://www.mopub.com/ HTTP/1.1
Host: www.mopub.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101
Firefox/17.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Proxy-Connection: keep-alive
Amos
--
Eliezer Croitoru
https://www1.ngtech.co.il
sip:ngtech@xxxxxxxxxxxx
IT consulting for Nonprofit organizations
eliezer <at> ngtech.co.il
