There should be the need to save an exception for the www.toowoombawebdesign.com:2083 site. It works for me without problems. Check the date and time in the clock on your computer: (double) click the clock icon on the Windows Taskbar. *https://support.mozilla.org/kb/Secure+Connection+Failed Rename the cert8.db file in the Firefox profile folder to cert8.db.old or delete the cert8.db file to remove intermediate certificates that Firefox has stored. <br /> If that helped to solve the problem then you can remove the renamed cert8.db.old file.<br /> Otherwise you can rename (or copy) the cert8.db.old file to cert8.db to restore the previous intermediate certificates.<br /> Firefox will automatically store intermediate certificates when you visit websites that send such a certificate. If that didn't help then remove or rename secmod.db (secmod.db.old) as well. You can use this button to go to the Firefox profile folder: *Help > Troubleshooting Information > Profile Directory: Show Folder *http://kb.mozillazine.org/Profile_folder_-_Firefox