I’m running two servers.
- One is a gateway running nginx for dispatching requests for different domains to different servers.
- The other one is the the server for my WordPress installation.
I’m using Varnish in front of Apache to do caching stuffs (only caching, no load balancing). I’ve turned off KeepAlive and set Timeout to 20 seconds for Apache.
Now I’m uploading an image of size 160KB and it fails, while my server configuration allows a maximum size of 20MB. After I submit the upload form in WordPress, I can see from the status line of my browser that the file is uploaded several times (mostly 2 or 3). When I use the asynch uploading plugin of WordPress, I can also see the progress bar growing from 0% to 100% and over and over again, until it fails.
When it fails, it stucks at the path /wp-admin/media-upload.php?inline=&upload-page-form= and Chrome says “Error 101 (net::ERR_CONNECTION_RESET): The connection was reset.” I’ve tried Firefox, exactly the same.
I cannot see anything relevant in the error logs of Varnish and Apache. However, I do see mutiple lines of the following log in the access log of nginx:
220.255.1.18 - - [01/Jan/2013:12:16:36 +0800] "POST /wp-admin/media-upload.php?inline=&upload-page-form= HTTP/1.1" 400 0 "http://MY-DOMAIN/wp-admin/media-new.php" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.101 Safari/537.11"
220.255.1.29 - - [01/Jan/2013:12:16:41 +0800] "POST /wp-admin/media-upload.php?inline=&upload-page-form= HTTP/1.1" 400 0 "http://MY-DOMAIN/wp-admin/media-new.php" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.101 Safari/537.11"
220.255.1.23 - - [01/Jan/2013:12:16:51 +0800] "POST /wp-admin/media-upload.php?inline=&upload-page-form= HTTP/1.1" 400 0 "http://MY-DOMAIN/wp-admin/media-new.php" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.101 Safari/537.11"
220.255.1.26 - - [01/Jan/2013:12:17:03 +0800] "POST /wp-admin/media-upload.php?inline=&upload-page-form= HTTP/1.1" 400 0 "http://MY-DOMAIN/wp-admin/media-new.php" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.101 Safari/537.11"
So what’s the problem? How can I fix it?
