This sounds like an Internet Explorer issue. Can you ask them to try downloading the file using another browser?
If it's a requirement that they use Internet Explorer, the following KB might help them resolve the issue.
Hope that helps.
Thank you for the response Alex. I'll send the customer the information and see if it helps.
Reading the KB article leads me to believe that may not be the problem. This problem appears to be transient since the customer was able to download 3 other files using the same IE without incident. The KB article suggests this is the settings problem that should affect all attempts at file downloads from HTTPS sites.
Good point. I'm still interested to see if the problem happens with a browser other than IE. IE is notorious for having problems downloading files over HTTPS/SSL.
BTW, were all the files in zip format? It's possible the file type is also a factor.
Ha. The customer's company won't let them use any browser other than IE. So I had to send the file to him via another service.
All the other files were zip files so it wasn't the file type causing the problem. I am wondering if the company blocked the Adobe service in between the first 3 files and the last one. They have blocked other file sending services that we've tried in the past.