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A client of mine using version 2.65 experienced this error with Firefox last week. I couldn't replicate it in Firefox myself, but after some Internet searching provided some suggestions. I haven't heard back as to whether any of my suggestions worked, but will post again if I hear back from them.
You might try...
1) Update Firefox to the most current version.
2) Make sure the website is listed in “security exceptions”. I saw mention that if the SSL is “self-signed”, this could case security issues in some versions of Firefox.
3) Add the domain to the list of Allowed Sites in Firefox.
4) Then close the CMS, clear all temporary files and cookies from Firefox, close Firefox, then restart everything and try again.
5) If still no success after the above, try disabling the Adobe Flash plugin in Firefox.
Thanks for posting back, Deborah...I appreciate it.
I've determined this IS a Firefox-based issue. Did the steps you mentioned, in fact; but the only fix thus far, for FF, is to disable the flash uploader. No problem in Chrome or IE.
What version of CMS Builder are you getting the error in?
If you aren't already using the latest version, are you able to install a test version of CMS Builder 3.07 on your server?
Let me know if that helps.
Are you using a self-signed ssl certificate? See: https://bugzilla.mozilla.org/show_bug.cgi?id=422180
And how large is the file you are uploading?
I'm fairly certain it is a self-signed certificate. How can I check/tell for sure?
The challenge occurs, for me, regardless of the file sizes...testing with either .5mb up to 5mb. Same thing. Turning off the Flash uploader and uploading (any size) images works fine on-at-a -time. Turning Flash uploader back on and problem occurs - reproducible every time.
Thanks for the guidance.
Ok, let's test if it's related to the SSL certificate. Does it work when you connect to the site via a http:// url and not a https:// url?
You could try this SSL checker:
If the certificate is self-signed, it should show in the test results as "The certificate is self-signed. Users will receive a warning when accessing this site unless the certificate is manually added as a trusted certificate to their web browser."
And I think that if the "issuer" of the cert is the same as the domain itself, then it is self-signed.
I'm having the same problem. I recently installed a Let's Encrypt SSL certificate on a shared hosting site and get the same error when using the Flash Uploader. Works fine in Chrome.
I checked the cert on https://www.sslshopper.com/ssl-checker.html and all is fine. It is not self signed.
It is clearly related to flash and FF.
Any chance there are plans to go away from the Flash uploader in the future?