Could not render the url. Could not get image from url.Navigation timeout

I've got a ASP.NET web application which contains the Winnovative HTML to PDF Converter.

This has been running for over a year successfully generating PDFs

However, this is no longer working, and the error being returned is:

Could not render the url. Could not get image from url.Navigation timeout..

I've checked the Winnovative FAQ and they suggest addin开发者_JS百科g a NavigationTimeout to the instance of the PdfConverter. I've added the following:

PdfConverter.NavigationTimeout = 500

However, this has not fixed the error. Furthermore, the page being converted only takes a fraction of a second to load when loading directly in the browser, so I don't believe its a performance issue with the page being rendered.

Has anyone experienced this problem before? Are there any known solutions/causes for this?

In the end I found out this error was occuring because we were trying to request a PDF from a HTTPS file.

I weren't able to solve why though.

Please see this question if you have an answer:

Generating PDF from HTTPS causes error

If anyone else gets this error: In our case, running on IIS 8.5, changing the application pool from ApplicationPoolIdentity to Network Service fixed it. So it seems it is a folder permission problem. Network service isn't ideal and really the actual folder permissions should be set.