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Did you check your security software (firewall)?

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process.

See:

• Server Not Found - Troubleshoot connection problems
• Configure firewalls so that Firefox can access the Internet

• Secure connection failed and Firefox did not connect

Hi all, sorry if I make some mistakes with my English language, because it'not my language of birth [57-years ago :-))]. I'm a Dutchman and working with Firefox from the beginning. I have the "Klinefelter Syndrome" and every large changing with a software product which I love to work with (every changing brings me in muddle and makes me comfuse). I can nothing for/with this syndrome because even with my other syndrome AD(H)D (without 'H') I get those syndromes during my birth and the doctors found them in 2007/ 2008, always 49-year too late! My knowhow about software/hardware (windows, a little Ubuntu) is from the Commodore64, Dos, StarOffice, Netscape, Firefox, untilll now, so I know enough.

About this SSL-error I'm a bunglar... I watched everything and nothing found. It started with version 3.6 (something like that) and now I've upgrated to version 4.01 (that 32-bits should be better) and the error is the same (nothing changed) "Foutcode: ssl_error_unsafe_negotiation". I work with Quad Core i7 @ 920 (Blomfield) with Windows 7 Pro x64. DirectX 11 AMD Radeon (Gfx) HD5770 all up-to-date. So when I try to use the https myself for banking, I have to go to IE9 because there all is okay!! But my general trust for Microsoft and all the large US-companies are for me not on the right level, I use Peerblock to block them them out of my PC. All US-companies working together with the goverment, with their law "U.S. Safe Harbor Privacy Principles" , with all Inteligences like the RSA, the CIA, the FBI. All US-companies gives all spies a free way on their networks, to spy on us... I don'like that. SSL or https is maybe more needed to block all spies. Hope Mozilla will find a fast solution for us.

~I'm open, honest and sincere to myself and to others....! ~ Since 2000 I'm an invalid person, despite my tries I'm sitting in a wheelchair (2005) and I'm bedridden. During my rehabilitation I learn my real friends and choose that the above selfmade slogan is our way of life.

See this link for information about 'Renegotiation' (CVE-2009-3555):

• http://wiki.mozilla.org/Security:Renegotiation
• https://wiki.mozilla.org/Security:Renegotiation#security.ssl.renego_unrestricted_hosts

You can look at the pref security.ssl.renego_unrestricted_hosts on the about:config page and add the sites that you want to allow to the string value.
Separate multiple host names by a comma.

To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.
You can use the Filter bar at to top of the about:config page to locate a pref more easily.