"There was a problem processing the uploaded file. -200"

[pyro888]

Recently I have problems uploading files larger than 15MB: 14,913KB works fine 15,660KB gives the error message in the title.  The forum is now running on HTTPS by the way after the update to Suite 4. 

.htaccess

<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule \.(js|css|jpeg|jpg|gif|png|ico)(\?|$) - [L,NC,R=404]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

php_value memory_limit 128M
php_value upload_max_filesize 250M
php_value post_max_size 250M
php_value max_execution_time 600

<ifmodule mod_expires.c>
ExpiresActive On
ExpiresByType text/css "access plus 24 hours"
ExpiresByType application/javascript "access plus 24 hourss"
ExpiresByType text/javascript "access plus 24 hours"
ExpiresByType image/jpeg "access plus 24 hours"
ExpiresByType image/jpg "access plus 24 hours"
ExpiresByType image/png "access plus 24 hours"
ExpiresByType image/gif "access plus 24 hours"
ExpiresByType image/bmp "access plus 24 hours"
</ifmodule>

The max upload values show up as expected in phpinfo. The problem happens also with an owncloud installation in the same environment. So I'm assuming it is something (new) serverside). 

General
[...]
Request Method:POST
Status Code:413 Request Entity Too Large

Response Headers
view source
Connection:close
Content-Type:text/html
Date:Wed, 11 Mar 2015 20:28:18 GMT
Server:nginx
Transfer-Encoding:chunked

PHP5.5 & Apache 2.4