tis 2009-10-27 klockan 15:00 +1100 skrev Gerard Saunders: > I have a strange issue where one website in particular is typically never being fully downloaded when accessing it via our squid proxy. > > It doesn't matter which browser is used, and the behaviour can be simulated using squidclient. If you do a browser reload/refresh, the page is downloaded fine, but subsequent calls to the same website fail. Sounds like the site may have a broken firewall which fails on TCP window scaling. alternatively an MTU issue. > In addition, if you don't use the proxy at all, the page is downloaded/rendered without any issues at all. Did you run this test on the proxy server itself, or some client with a different OS? > HTTP/1.0 200 OK > Date: Mon, 26 Oct 2009 23:56:41 GMT > Server: Apache/2.0.52 (PU_IAS) > Expires: Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT, Sat, 01 Jan 2000 00:00:00 GMT > Content-Language: en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en, en > Content-Length: 17191 > Content-Type: text/html;charset=utf-8 > Age: 20849 > X-Cache: MISS from titania.its.deakin.edu.au > X-Cache-Lookup: MISS from titania.its.deakin.edu.au:3128 > Via: 1.0 titania.its.deakin.edu.au:3128 (squid/2.6.STABLE21) > Proxy-Connection: close > > g/community/print_icon.gif" > alt="Print this page" > title="Print this page" id="icon-print" /> > </a> > </li> > > As show above the majority of the webpage is missing.. e.g. <html><body> tags Ugh.. that looks bad. But again may be caused by above mentioned firewalls I guess depending on how broken they are.. A quick try if this is the case is to echo 0 >/proc/sys/net/ipv4/tcp_window_scaling but be warned that this has quite negative impact on TCP performance over long distance or fast networks. Regards Henrik
