Our PDF files open fine from local hard disks, and http locations. However, We are having trouble opening PDF files from a FTP server. After double-clicking on the file, the Adobe 'grey' background loads, and nothing else. At first time it opened fine in all computers, but afterwards it will not open. If we download the files from the server, the same file opens fine. We have tried in different OS like XP, Windows 7, windows 8 with different browsers. same problems occurred. In all cases, the installed adobe reader was Adobe Reader 9 and above(9, 10& 11). After we got one solution that to disable "Protected mode" in reader settings. If we disable protected mode, it is fine. But the issue is, we have to provide those PDf files to our customers through our website. So we cannot disable it in customer's pc. Any alternate solution for this problem? Why this problem occurs? How we can overcome from this error?
Your PDF probably contains some sort of active element that triggers the "Protected mode".
The reason it works locally is probably that the local computer is a "Privileged Location" and the FTP server is isn't.
My suggestion is tat you either get rid of the thing that triggers the protected Mode (whatever it may be) or better yet make the users download the file before opening it.