Jorge Perez wrote:
Hello, we suddenly today we cant open facebook and we need it urgently for work.
There is no DNS Issue, all i get is a blank page and nothing happens. Before it was everything ok...
Any ideas??
Lucky day, I was about to post the answers :) We have had an unusually
high number of people on IRC live help with the same problem in the last
few hours.
Squid-2.7 can be made to work by adding "server_http11 on" to squid.conf.
Squid-3.1 is not affected.
Other versions have no good fix yet. Perhapse routing requests through
one of the unaffected versions or allowing clients to go direct to
facebook without the proxy.
Why?
Facebook seem to have changed something on their servers very, very
recently. They are right now violating HTTP in several ways.
The bad violation resulting in blank pages is that some the mandatory
HTTP headers, including Date: are missing from their replies to HTTP/1.0
clients.
The other violation is that they are responding with different HTTP
versions and header sets to HTTP/1.0 and HTTP/1.1 depending on which
version is used to query them.
When queried with HTTP/1.1 request the right headers, or at least a
minimally usable set are sent out.
Amos
Here is access.log
1279813884.035 144 192.168.169.238 TCP_MISS/200 1704 GET http://static.ak.fbcdn.net/rsrc.php/zANMV/hash/9hba0udp.css - DIRECT/65.216.161.59 text/css
1279813885.265 2175 192.168.169.238 TCP_MISS/200 793 GET http://www.facebook.com/? - DIRECT/66.220.147.11 text/html
1279813887.957 5110 192.168.169.238 TCP_MISS/404 11091 GET http://www.facebook.com/t - DIRECT/66.220.147.11 text/html
1279813888.020 1558 192.168.169.238 TCP_MISS/200 453 GET http://www.facebook.com/? - DIRECT/66.220.147.11 text/html
1279813893.897 9622 192.168.169.238 TCP_MISS/200 688 GET http://search.twitter.com/search.json? - DIRECT/128.242.245.43 application/json
iptables proxy rules:
echo "Aplicando reglas iptables..."
iptables -t nat -F
iptables -t nat -X
iptables -t nat -Z
iptables -F
iptables -X
iptables -Z
##
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
##
iptables -t nat -A POSTROUTING -s 192.168.169.0/24 -o eth2 -j MASQUERADE
iptables -t nat -A PREROUTING -s 192.168.169.0/24 -d ! 192.168.169.0/24 -p tcp --dport 80 -j REDIRECT --to-port 3128
##
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 993 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 110 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 465 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 25 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p tcp --dport 53 -j ACCEPT
iptables -A FORWARD -s 192.168.169.0/24 -i eth2 -p udp --dport 53 -j ACCEPT
iptables -A FORWARD -s 192.168.2.0/24 -i eth2 -p tcp --dport 1863 -j ACCEPT
##
echo 1 > /proc/sys/net/ipv4/ip_forward
squid.conf
http_port 192.168.169.3:3128 transparent
cache_dir ufs /usr/local/squid/var/cache 250 16 256
cache_effective_user squid
cache_effective_group squid
access_log /usr/local/squid/var/logs/access.log squid
################################
acl localnet src 192.168.169.0/255.255.255.0
acl localhost src 127.0.0.1/255.255.255.255
acl all src 0.0.0.0/0.0.0.0
###########################
acl SSL_ports port 443 563
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
#### SITIOS BLOKEADOS #####
acl restobb src 192.168.169.1-192.168.169.129
acl sucky_urls dstdomain .facebook.com .twitter.com .doubleclick.com .fotolog.com .warez-bb.org .fotolog.cl .chilewarez.org .rapidshare.com .megaupload.com .rapidshare.de .medi$
deny_info http://www.trabajoweb.cl/error.html sucky_urls
http_access deny restobb sucky_urls
######################## NO DESCARGAS #####
acl resto src 192.168.169.1-192.168.169.29/32
acl descargas_negadas urlpath_regex -i \.(exe|vqf|gz|zip|r[ap][rwm]|avi|mpe?g?3?|qt|ra?m|iso|wav|mov|torrent)(\?.*)?$
deny_info http://www.trabajoweb.cl/error.html descargas_negadas
http_access deny resto descargas_negadas
######################## SITIOS PROYECTOS ###############
acl restobb2 src 192.168.169.130-192.168.169.149
acl sucky_urls2 dstdomain .doubleclick.com .warez-bb.org .fotolog.cl .chilewarez.org .rapidshare.com .megaupload.com .rapidshare.de .mediafire.com .depositfiles.com .taringa.co$
deny_info http://www.trabajoweb.cl/error.html sucky_urls2
http_access deny restobb2 sucky_urls2
########################
######################## SITIOS ESTUDIO ###############
acl restobb3 src 192.168.169.190-192.168.169.219
acl sucky_urls3 dstdomain .doubleclick.com .warez-bb.org .fotolog.cl .chilewarez.org .rapidshare.com .megaupload.com .rapidshare.de .mediafire.com .depositfiles.com .taringa.co$
deny_info http://www.trabajoweb.cl/error.html sucky_urls2
http_access deny restobb3 sucky_urls2
########################
########################
http_access allow localnet
http_access allow localhost
http_access deny all
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
##############################
http_reply_access allow localnet
http_reply_access deny all
acl FTP proto FTP
always_direct allow FTP
#############################
#REGLAS DESCARGAS
acl normales src 192.168.169.30-192.168.169.129/32
acl tecnicos src 192.168.169.130-192.168.169.149/32
acl administrador src 192.168.169.150-192.168.169.189/32
acl estudio src 192.168.169.190-192.168.169.219/32
acl descargas urlpath_regex -i \.(exe|vqf|gz|zip|r[ap][rwm]|avi|mpe?g?3?|qt|ra?m|iso|wav|mov)(\?.*)?$
delay_pools 4
####
delay_class 1 1
delay_parameters 1 10240/10485760 10240/10485760
delay_access 1 allow normales descargas
delay_access 1 deny all
###
###
delay_class 2 1
delay_parameters 2 30720/104857600 30720/104857600
delay_access 2 allow tecnicos descargas
delay_access 2 deny all
####
delay_class 3 1
delay_parameters 3 30720/104857600 30720/104857600
delay_access 3 allow administrador descargas
delay_access 3 deny all
###
delay_class 4 1
delay_parameters 4 10240/10240 10240/10240
delay_access 4 allow estudio
delay_access 4 deny all
--
Please be using
Current Stable Squid 2.7.STABLE9 or 3.1.5
