Quote:ERRORThe requested URL could not be retrieved

 

While trying to retrieve the URL: [/url][url=<___base_url___>/index.php][/url][url=<___base_url___>/index.php]https://www.linux-noob.com/forums/index.php?

 

The following error was encountered:

 

* Zero Sized Reply

 

Squid did not receive any data for this request.

 

Your cache administrator is webmaster.

Generated Mon, 31 Oct 2005 07:56:18 GMT by smoothwall (squid/2.5.STABLE9)

Quote:11.51 Why do I sometimes get ``Zero Sized Reply''? 

This happens when Squid makes a TCP connection to an origin server, but for some reason, the connection is closed before Squid reads any data. Depending on various factors, Squid may be able to retry the request again. If you see the ``Zero Sized Reply'' error message, it means that Squid was unable to retry, or that all retry attempts also failed.

 

What causes a connection to close prematurely? It could be a number of things, including:

 

1. An overloaded origin server.

2. TCP implementation/interoperability bugs.

3. Race conditions with HTTP persistent connections.

4. Buggy or misconfigured NAT boxes, firewalls, and load-balancers.

5. Denial of service attacks.

 

You may be able to use tcpdump to track down and observe the problem.

 

Some users believe the problem is caused by very large cookies. One user reports that his Zero Sized Reply problem went away when he told Internet Explorer to not accept third-party cookies.

 

Here are some things you can try to reduce the occurance of the Zero Sized Reply error:

 

1. Delete or rename your cookie file and configure your browser to prompt you before accepting any new cookies.

2. Disable HTTP persistent connections with the server_persistent_connections and client_persistent_connections directives.

3. Disable any advanced TCP features on the Squid system. Disable ECN on Linux with echo 0 > /proc/sys/net/ipv4/tcp_ecn/.

 

If this error causes serious problems for you, Squid developers would be happy to help you uncover the problem. However, we will require high-quality debugging information from you, such as tcpdump output, server IP addresses, operating system versions, and access.log entries with full HTTP headers.

 

If you want to make Squid give the Zero Sized error on demand, you can use the short C program below. Simply compile and start the program on a system that doesn't already have a server running on port 80. Then try to connect to this fake server through Squid:

 

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <assert.h>

 

int

main(int a, char **B)

{

struct sockaddr_in S;

int s,t,x;

s = socket(PF_INET, SOCK_STREAM, 0);

assert(s > 0);

memset(&S, '\0', sizeof(S));

S.sin_family = AF_INET;

S.sin_port = htons(80);

x = bind(s, (struct sockaddr *) &S, sizeof(S));

assert(x == 0);

x = listen(s, 10);

assert(x == 0);

while (1) {

struct sockaddr_in F;

int fl = sizeof(F);

t = accept(s, (struct sockaddr *) &F, &fl);

fprintf(stderr, "accpeted FD %d from %s:%d\n",

t, inet_ntoa(F.sin_addr), (int)ntohs(F.sin_port));

close(t);

fprintf(stderr, "closed FD %d\n", t);

}

return 0;

}

Quote:hi guys 

anytime i try to reply to a PM from someone on this forum i get an error (after 10 or so seconds)