Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am using SWFUpload to upload files to a database (Windows XP) over https. Everything works as expected in IE (7 and 8), but using my Firefox 3.3.15 it fails without error message. Using the upload mechanism using http works fine.

I found this thread using google. They describe that installing the CAs certificate as trusted issuer would help. Unfortunatly it did not (it was a certificate issued by a CaCert authority).

It works on the machine of my colleague who uses Firefox 3.3.15, but he cannot recall that he did anything special to make it work. I had a look at other machines using Firefox and none of them were able to upload a file to the database.

I red that SWFUpload uses flash and that flash might use other certificates than Firefox itself. Does anyone know anything about it?

What can i do to make it work? Any suggestions?

share|improve this question

It is a problem of the session. If your system had to do a validation of login, when you upload your file, your session will be lost if you use Firefox or Chrome. Internet Explorer doesn't have this problem.

You can refer to this discussion.

Someone who always had this problem suggested to pass the session value or read it from the cookie and then pass it to the server.

share|improve this answer
that url is the demo in the swfupload offical upload – Tommy Sep 21 '11 at 1:25
cookie seems to work, i get "FlashCookie set to Sep 21, 2011 12:21:14.000000" usinf Win XP, Firefox 6 – Thariama Sep 21 '11 at 7:23
what is the language you use? jsp or asp or php ? asp and php had its solution, only struts2 did not soluted – Tommy Sep 21 '11 at 9:31
i am using perl on the server side – Thariama Sep 21 '11 at 9:44

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.