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Can't add exception to a https site, with self signed certificate!

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Can't add exception to a https site, with self signed certificate!

When i try to connect to a site with a self signed certificate i can't complete the connection.

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New Contributor

Re: Can't add exception to a https site, with self signed certificate!

gperes, I ran into this same issue with a Cisco device that had a self-signed cert by default.

Preferences - Advanced - Encryption - View Certificates - * Authorities *

There was an authority named "IOS-self-signed" or something like that from the Cisco device. Deleting that and then restarting Firefox solved the issue for me.

What helped me find that Authority to look for was using Safari to go to the device and view the SSL info. Hate that Firefox (21.0) blocks you completely and doesn't even let you view the cert info. PLEASE FIX Mozilla!! I should at least be able to view the cert.

19 REPLIES
New Contributor

Re: Can't add exception to a https site, with self signed certificate!

There are a variety of firefox extensions to mitigate this behavior:

https://addons.mozilla.org/en-US/firefox/search/?q=certificate

New Contributor

Re: Can't add exception to a https site, with self signed certificate!

Still can't access the page! These addons only shows or import/export the certificates. Don't fix the problem.

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New Contributor

Re: Can't add exception to a https site, with self signed certificate!

I am having the same problem. It says the certificate is not trusted BUT doesn't give you the choice to add an exception. But get this... I have another computer and it works just fine on that one. How the heck do you explain that one? All settings are the same. I'm so tired of you Firefox.

Site Moderator

Re: Can't add exception to a https site, with self signed certificate!

Can you post a link to such a page?

If you have visited that domain previously then you may already have stored an exception.

You can try to 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.

If that helped to solve the problem then you can remove the renamed cert8.db.old file.
Otherwise you can rename (or copy) the cert8.db.old file to cert8.db to restore the previous intermediate certificates.
Firefox will automatically store intermediate certificates when you visit websites that send such a certificate.


Also check the date and time in the clock on your computer: (double) click the clock icon on the Windows Taskbar.

New Contributor

Re: Can't add exception to a https site, with self signed certificate!

Still the same problem!

New Contributor

Re: Can't add exception to a https site, with self signed certificate!

No change, I've moved on to Chrome.

New Contributor

Re: Can't add exception to a https site, with self signed certificate!

I will have to change the browser and not recommend to anyone, I've posted for almost a month and till now, nobody from mozilla have at least the consideration to try to discuss the problem.

New Contributor

Re: Can't add exception to a https site, with self signed certificate!

I found an answer at this site http://support.mozilla.org/en-US/questions/929298

Quote: hello shrenikd & dtrager - apparently the hiding of the possibility to add exceptions in an iframe is by design in order to avoid fraudulent attempts to apply a certificate to users who think they are on a different page (see new comments on the bug).

@dtrager - in case the page you're trying to access is embedded in an iframe, right-click the error page, click on "this frame" > "show only this frame" and hopefully you can add an exception in the next step. this should only be necessary once if you choose to permanently store the exception.

New Contributor

Re: Can't add exception to a https site, with self signed certificate!

Still don't work, it is not in a frame, so doesn't work this workaround. I will change the browser is not possible that a question like this one is posted for this long and nobody from mozilla have at least the consideration to contact to understand the problem. I always used the firefox browser, but for the first time in my life i think to use other browser that is not firefox.