The problem is that "http://xxx.xxx/report" is in a different physical machine that the one where the web pages are. I can access only by http to PDF files since they are outside my LAN. Thanks for your answer anyway. Germán.

Hi, I have a Web Project in .NET and I want to validate if a link really exists. This is why I need that: When users press a button in a web page, an external process is executed. This process generates a PDF file and returns the file name. This file is allocated in a site (http://xxx.xxx.xxx.xxx/report/filexxxx.pdf) by the external process. Then user press a "Refresh Button" in the web page and a link is automatically generated pointing to the generated file. The problem is that sometimes, the process don't generate any file, so when user clicks the link, he receives the message "The page cannot be displayed". Note: Web pages and PDF files are in different IIS. Thanks. I need to validate the link, so I wont show it if it doesn't exist. It is possible? Any idea?