Symptoms

Attempting to attach a file results in:

HTTP logs contain:

HTTP/1.1 413 Request Entity Too Large

Diagnosis

System is behind some sort of proxy, firewall or network security

Cause

The network security/proxy has a limitation on request size 

Resolution

Increase the allowed request body limit for the proxy. For example:

• Apache - http://httpd.apache.org/docs/current/mod/core.html#limitrequestbody
• Nginx:

  • modify the configuration file and reload:

    $ vi /usr/local/nginx/conf/nginx.conf

  • modify the follow parameter to increase the size:

    client_max_body_size 1M

  • reload the webserver

    $ /usr/local/nginx/sbin/nginx -s reload