I have a very similar problem.

I'm using itextsharp 4.0.8

I have used it to generate PDF file locally on my machine and it works.  
I uploaded to the web server and it doesn't work.

I generate PDF file in MemoryStream and do OutputStream to browser, for the
user to save the file. 

Locally it askes the file download dialog box and I was able to save and
open it correctly.

from the web server, the save file dialog box appears but there is no bytes
saved.  [0 bytes].

Hence when I try to open it throws the error message as the file "... is
either not a supported fily type or because the file has been damaged"

I upgraded both local and web server with Adobe Reader 8.1.2 and still
didn't seem to solve the problem

8.1.1 also had the problem.

I read in this post that iTextSharp doesn't use any Adobe Reader dlls, but
then it must be some settings in Web Server, or permissions or something. 
Google didn't help me find it either.  Is there any particular settings/
permissions needed by iTextSharp to function on a web Server?

thanks a bunch
knathan



Rick Roen wrote:
> 
> I'm following up on a problem I have with clients with older versions of
> Adobe Reader (< 7) who cannot read PDF created by iTextSharp after I
> updated
> to Adobe Reader 8.1.2.
> 
>  
> 
> Does iTextSharp use a dll or anything from the version of Adobe Reader
> that
> is located on the computer that runs the program (or perhaps from where it
> was compiled)?  If so that might explain why this would be happening after
> I
> upgraded. There is nothing else that I can think of that has changed in my
> program.
> 
>  
> 
> Regards,
> 
>  
> 
> Rick
> 
> 
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