I have a site using a self-signed cert (which prompts for “trust this site and continue”), and in IE, occasionally when the user attempts to download a CSV file (which is handled by writing the file to the file system and sending a redirect header), the user can be prompted with the Windows authentication screen for username/password.
This has been observed in XP/Windows-7 in IE7 and IE8. This only happens when our site has an incorrect certificate and the user attempts to download a file with opens in Excel. What could be happening?
Fixing the certificate is one fix, but I’d like to have this working regardless.
There is no solution, unfortunately.