Installing & Running PDFgServlet Add-on On Remote Server

I'm using CF11 Developer Edition.

Installed PDFgServlet on a remote server.

Using CFAdministrator on my Developer Edition, can VERIFY the remote PDF Service Manager.

But when I go and try to use the cfhtmltopdf tag on my Developer Edition, I get CANNOT CONNECT TO SERVER.

I go to the remote server running PDFgServlet, can see response code 200's when I verify the PDF Service Manager "GET /PDFgServlet/verify HTTP/1.1" 200 0

But I get "POST /PDFgServlet/ HTTP/1.1" 400 1407 when I try to use the tag

If I switch back to my local copy, I get the PDF rendered.

Any thoughts?