| title: | Re mod proxy and disconnections |
|
Hi Rainer, *;
and first off, thanks for being patient enough reading through all the long
message to the very end, as well as for your comment on that. :)
Rainer Sabelka schrieb:
[...]
Ive observerd similar problems with large POST requests which sometimes time
out on the backend servers while the client is sending the request body (like
you with mod_proxy/apache 2.2 on Ubuntu 8.04).
Yes I am seeing upload/POST related issues once in a while, as well (looking
at the Java apps, they end up being something like "upload of
multipart/form-data failed, stream ended unexpectedly"). Seems to depend
upon the size of POSTs indeed, and happens significantly less often than the
download-related issue.
But the whole issue might actually not be caused by apache at all, but by a
bug in the TCP implementation of the linux kernel 2.6.24. (See this thread:
rel="nofollow" marc.info/?t=121518334200003&r=1&w=2 marc.info/?t=121518334200003&r=1&w=2 )
For me setting /proc/sys/net/ipv4/tcp_frto to 0 helped to solve the problem
for a coulple of users, but not for everyone.
Thanks for the pointer, I will dig into this and see where it gets me,
however this issue did also exist in our "old" reverse proxy environment
(ubuntu 6.06.1, apache 2.0) so I think it is at least not completely Linux
2.6.24 related...
Cheers & good luck on that as well.
Kristian
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