Hello,

There are a couple things that could be going on here.

First up, the first link uses SSL, notice the https, which could be causing problems.

Secondly, the first link doesn't actually link to an image, but rather some form of "handler" for an image. The second links directly to a file, i.e. .jpg. It might be the case that you have to first read the bytes from the URL, and then pass them into iTextSharp.

Gary