A 404 error is returned when uploading a large file via the File Picker function – VertiGIS

Overview:

Solution:

The web application has a configurable maximum allowable upload size (see http://forums.iis.net/t/1169846.aspx). This can be configured in the REST web.config file by changing the maxRequestLength and maxAllowedContentLength values (both must be changed).
By default, we configure this to "20480" to allow approximately 20MB uploads. When the limit is exceeded, IIS just drops the request and a 404 is returned.

*Note: the limit does not include the overhead for encryption which takes about 33% of the file size. A 20480 limit will allow a 15Mb file to be uploaded.

Allowing uploads larger than 20MB is ill-advised. It is possible, but we don't recommend it.

We do recommend using the file size validator on the form item. The default is 10mb.