Hello!

On Tue, Sep 08, 2015 at 12:14:19PM -0400, justink101 wrote:

> Hello, saw this logged in the error log in our NginxPlus (nginx/1.7.11
> (nginx-plus-extras-r6-p1) load balancer. Any ideas?
>
> 2015/09/08 14:31:02 [alert] 2399#0: *452322 zero size buf in output t:0 r:0
> f:1 0000000000000000 0000000000000000-0000000000000000 0000000002F51428 0-0
> while sending request to upstream

This message suggests there is a bug somewhere. In particular, if
you use 3rd party modules ("extras" suggests this may be the
case), it may be a bug in a 3rd party module. The message should
contain additional information to help to identify the request
triggered the bug.

Also, as you are using nginx-plus, you may want to contact
technical support.

--
Maxim Dounin
http://nginx.org/

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