# Partial downloads **URL:** \ **Category:** NGINX\ **Created:** [February 18, 2012, 9:44pm UTC](https://www.ruby-forum.com/t/partial-downloads/216997 "2012-02-18T21:44:36Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [February 18, 2012, 9:44pm UTC](https://www.ruby-forum.com/t/partial-downloads/216997/1 "2012-02-18T21:44:36Z")
Hello, guys, Recently, I’ve started seeing a strange problem - sometimes it happens that nginx only transfers only a small part of the file and the download gets interrupted. When I debug it, the issue narrows down to “client timed out (110: Connection timed out) while sending response to client”, but this is certainly not the case, as it happens very quickly (almost immediately after starting the download, in a less than a second). I don’t see anything unusual with tcpdump. I was wondering whether some of you has an idea what can be the root cause for this strange behaviour? Thanks in advance. nginx version: nginx/1.1.15 built by gcc 4.1.2 20080704 (Red Hat 4.1.2-51) TLS SNI support disabled configure arguments: --user=nginx --group=nginx –prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx –conf-path=/etc/nginx/nginx.conf –error-log-path=/var/log/nginx/nginx.log –http-log-path=/var/log/nginx/access.log –http-client-body-temp-path=/var/lib/nginx/tmp/client\_body –http-proxy-temp-path=/var/lib/nginx/tmp/proxy –http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi –http-scgi-temp-path=/var/lib/nginx/tmp/scgi –pid-path=/var/run/nginx.pid --lock-path=/var/lock/subsys/nginx –with-debug --with-http\_ssl\_module --with-http\_geoip\_module –with-http\_sub\_module --with-http\_realip\_module –with-http\_gzip\_static\_module --with-http\_random\_index\_module –with-http\_secure\_link\_module --with-http\_degradation\_module –with-http\_stub\_status\_module --with-http\_dav\_module –without-mail\_pop3\_module --without-mail\_imap\_module –without-mail\_smtp\_module --without-http\_uwsgi\_module --with-file-aio –with-cc-opt=‘-O2 -g -m32 -march=i686 -mtune=generic -fasynchronous-unwind-tables’ 2.6.18-274.7.1.el5PAE i686 aio on sendfile on directio on tcp\_nodelay off tcp\_nopush off open\_file\_cache on client\_body\_timeout 10 client\_header\_timeout 10 send\_timeout 10 keepalive\_timeout 30 max\_ranges 5 Posted at Nginx Forum: > **[Partial downloads](https://forum.nginx.org/read.php?2,222614,222614#msg-222614)** > > Hello, guys, Recently, I've started seeing a strange problem - sometimes it happens that nginx only transfers only a small part of the file and the download gets interrupted. When I debug it, the issue narrows down to "client timed out (110:... ---
**Author:** ![Samael](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b5ac83/32.png) [@Samael](https://www.ruby-forum.com/u/Samael)\ **Post date:** [February 18, 2012, 10:49pm UTC](https://www.ruby-forum.com/t/partial-downloads/216997/2 "2012-02-18T22:49:42Z")
Hello! On Sat, Feb 18, 2012 at 03:43:59PM -0500, Samael wrote: > Thanks in advance. > Could you please provide debug log? See > [GitHub - nginxinc/nginx-wiki: ARCHIVED -- Source for the now archived NGINX Wiki section of https://www.nginx.com · GitHub](http://wiki.nginx.org/Debugging) for details. Maxim D. ---
**Author:** ![Samael](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b5ac83/32.png) [@Samael](https://www.ruby-forum.com/u/Samael)\ **Post date:** [February 18, 2012, 11:13pm UTC](https://www.ruby-forum.com/t/partial-downloads/216997/3 "2012-02-18T23:13:52Z")
Of course - [http://pastebin.com/raw.php?i=RnZv58Zq](http://pastebin.com/raw.php?i=RnZv58Zq) Posted at Nginx Forum: > **[Re: Partial downloads](https://forum.nginx.org/read.php?2,222614,222619#msg-222619)** > > Hello, guys, Recently, I've started seeing a strange problem - sometimes it happens that nginx only transfers only a small part of the file and the download gets interrupted. When I debug it, the issue narrows down to "client timed out (110:... ---
**Author:** ![Samael](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b5ac83/32.png) [@Samael](https://www.ruby-forum.com/u/Samael)\ **Post date:** [February 18, 2012, 11:38pm UTC](https://www.ruby-forum.com/t/partial-downloads/216997/4 "2012-02-18T23:38:03Z")
Hello! On Sat, Feb 18, 2012 at 05:13:37PM -0500, Samael wrote: > Of course - [http://pastebin.com/raw.php?i=RnZv58Zq](http://pastebin.com/raw.php?i=RnZv58Zq) The log in question suggests there is just normal send\_timeout: … 2012/02/18 22:03:36 [debug] 4368#0: \*1 sendfile: @2273599 684918465 2012/02/18 22:03:36 [debug] 4368#0: \*1 sendfile: 96360, @2273599 96360:684918465 2012/02/18 22:03:36 [debug] 4368#0: \*1 http write filter 0835AC9C 2012/02/18 22:03:36 [debug] 4368#0: \*1 http copy filter: -2 “/test/bigfile?” 2012/02/18 22:03:36 [debug] 4368#0: \*1 http writer output filter: -2, “/test/bigfile?” 2012/02/18 22:03:36 [debug] 4368#0: \*1 event timer: 23, old: 2450531909, new: 2450532133 2012/02/18 22:03:49 [debug] 4368#0: \*1 event timer del: 23: 2450531909 2012/02/18 22:03:49 [debug] 4368#0: \*1 http run request: “/test/bigfile?” 2012/02/18 22:03:49 [debug] 4368#0: \*1 http writer handler: “/test/bigfile?” 2012/02/18 22:03:49 [info] 4368#0: \*1 client timed out (110: Connection timed out) while sending response to client, client: 1.1.1.2, server: 1.1.1.1, request: “GET /test/bigfile HTTP/1.1”, host: “1.1.1.1”, referrer: “[http://1.1.1.1/test/](http://1.1.1.1/test/)” 2012/02/18 22:03:49 [debug] 4368#0: \*1 http finalize request: 408, “/test/bigfile?” a:1, c:1 … Note that nothing happens with the connection in question between “22:03:36” and “22:03:49”. Looks ok unless you have additional info which suggests that data from socket buffer was sent to the client and it’s nginx fault it doesn’t sent more data. It’s slightly off from expected 10 seconds as per your config part you’ve provided, though this is likely related to the fact that your nginx processes are disk-bound and nginx wasn’t able to process timer in time. You may want to take a look at sendfile\_max\_chunk directive, see > **[Module ngx\_http\_core\_module](http://nginx.org/en/docs/http/ngx_http_core_module.html#sendfile_max_chunk)** > > This directive appeared in version 1.11.8. Maxim D. ---
**Author:** ![Samael](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/b5ac83/32.png) [@Samael](https://www.ruby-forum.com/u/Samael)\ **Post date:** [February 19, 2012, 12:24am UTC](https://www.ruby-forum.com/t/partial-downloads/216997/5 "2012-02-19T00:24:25Z")
Thank you, this was useful. I’ve tried it again and this time I correlated the events in the log and the tcpdump capture. It seems that the client is requesting a window update, which doesn’t receive an answer and triggers the send timeout. I think that this is the issue. Thank you very much for your help. Posted at Nginx Forum: > **[Re: Partial downloads](https://forum.nginx.org/read.php?2,222614,222621#msg-222621)** > > Hello, guys, Recently, I've started seeing a strange problem - sometimes it happens that nginx only transfers only a small part of the file and the download gets interrupted. When I debug it, the issue narrows down to "client timed out (110:...