Rotativa generating blank PDF in Server

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PDF

MVC5

We are using Rotativa in a .Net MVC 5 project. it works like a charm locally and fails (generates a blank PDF) equally when deployed to server. However, if I login to server and access the website as localhost it generates PDF just fine.

So it looked like a permission issue with which Application pool is running on. So, for testing purpose, I changed to run the App Pool to run on "Local System". Still same issue.

We have also tried:

"ViewasPDF"
App settings which looks like: <add key="WkhtmltopdfPath" value="<path to the folder>">
Below is the code:

return new ActionAsPdf("ActionMethod",new { id = id, partSelected = part, selectedTab = selectedTab, isDownload = true })
{
FileName = fileName,
PageMargins = { Left = 0, Right = 0 },
CustomSwitches = "--disable-external-links --disable-internal-links --disable-smart-shrinking --viewport-size 1600x900 --load-error-handling ignore",
PageOrientation = Rotativa.Options.Orientation.Portrait,
PageSize = Rotativa.Options.Size.A4,
PageWidth = 210,
PageHeight = 297
};