Uploading Excel files in an SSL enviroment

Uploading Excel files in an SSL enviroment

  
I have a simple espace that loads an excel file and displays its contents, which works fine on a server that without a SSL certificate.

When I publish this to a server with an SSL certificate (Self SSL form IIS 6.0 toolkit in development machine) we get the following error
1] Error - could not read from file. Not a valid/supported excel file. System error - Unspecified error

Why is this and how to overcome this problem.
This is an issue with the motor jet.
The workaround is to restart IIS (iisreset).

Always submit these errors to increase its probability and importance for the support team to solve it.
Cheers,
Pedro Queirós