4.17 Non-functional connect timeouts
diff --git a/docs/FAQ b/docs/FAQ index 8d4b9f2..d2b9988 100644 --- a/docs/FAQ +++ b/docs/FAQ
@@ -1,4 +1,4 @@ -Updated: Jan 14, 2009 (http://curl.haxx.se/docs/faq.html) +Updated: Feb 23, 2009 (http://curl.haxx.se/docs/faq.html) _ _ ____ _ ___| | | | _ \| | / __| | | | |_) | | @@ -71,6 +71,7 @@ 4.14 Redirects work in browser but not with curl! 4.15 FTPS doesn't work 4.16 My HTTP POST or PUT requests are slow! + 4.17 Non-functional connect timeouts on Windows 5. libcurl Issues 5.1 Is libcurl thread-safe? @@ -885,6 +886,23 @@ You can disable libcurl's use of the Expect: header the same way you disable any header, using -H / CURLOPT_HTTPHEADER, or by forcing it to use HTTP 1.0. + 4.17 Non-functional connect timeouts + + In most Windows setups having a timeout longer than 21 seconds make no + difference, as it will only send 3 TCP SYN packets and no more. The second + packet sent three seconds after the first and the third six seconds after + the second. No more than three packets are sent, no matter how long the + timeout is set. + + See option TcpMaxConnectRetransmissions on this page: + http://support.microsoft.com/?scid=kb%3Ben-us%3B175523&x=6&y=7 + + Also, even on non-Windows systems there may run a firewall or anti-virus + software or similar that accepts the connection but does not actually do + anything else. This will make (lib)curl to consider the connection connected + and thus the connect timeout won't trigger. + + 5. libcurl Issues 5.1 Is libcurl thread-safe? @@ -898,7 +916,7 @@ If you use a OpenSSL-powered libcurl in a multi-threaded environment, you need to provide one or two locking functions: - http://www.openssl.org/docs/crypto/threads.html#DESCRIPTION + http://www.openssl.org/docs/crypto/threads.html If you use a GnuTLS-powered libcurl in a multi-threaded environment, you need to provide locking function(s) for libgcrypt (which is used by GnuTLS
