Invalid security certificate for all websites on Mac (sec_error_unknown_issuer)

Since connecting to my university network, a message in Firefox systematically keeps popping up for every website. I'm now using internet somewhere else - where I've been connected many times before without a problem - and firefox keeps annoyingly giving me this message.
This is the message: cs-700-main(...):443 uses an invalid security certificate. This certificate is not trusted because the issuer certificate is unknown. Sec_error_unknown_issuer.
Apparently the organization issuing the certificate is 'vernier networks, inc.'.
I am using a Macbook bought recently and didn't have any problems until I connected to my university network. I'm not really familiar with Macs, so I don't really know what to do at this point to fix this. Apparently, people have had this problem before but no one has been able to help them. Can anyone help? This is really frustrating and it means I have to turn to Safari or Google Chrome!!
Thanks

It is related to browser settings do,
Firefox -> Tools -> Advanced -> view certificates -> servers -> Add exceptions
and add the your url in that dialogue box.

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Invalid security certificate for my website host-they say the problem is Apple Safari and use Firefox instead

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The specific error message is:
Their response to my inquiry and my reply is shown below:

Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
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There are three menus in the window. What is selected in each of them?

Error message on every website says: whateversite 443 uses an invalid security certificate

Every website and page, including Firefox and Mozilla webpage and even within Firefox preferences, I get an error message like this: mozilla.org:443 uses an invalid security certificate. I then must click cancel over and over to get away from the page.
My internet is fine, and I am not having any issues with Chrome or Safari on my OS X 10.6.3. however, I prefer Firefox for many reasons. I have already tried starting in Safe mode and reset everything to default, but made no change. Also reinstalled Firefox. Please advise. Thank you!
== This happened ==
Every time Firefox opened
== in April 2010 ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4

Here is what I get when I try and load THIS PAGE in Firefox. I used Chrome to paste this.
Troubleshooting Information
This page contains technical information that might be useful when you're
trying to solve a problem. If you are looking for answers to common questions
about Firefox, check out our support web site.
Copy all to clipboard
Application Basics
Name
Firefox
Version
3.6.3
Profile Directory
Show in Finder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Modified Preferences
Name
Value
browser.history_expire_days.mirror 180
browser.places.smartBookmarksVersion 2
browser.startup.homepage_override.mstone rv:1.9.2.3
extensions.lastAppVersion 3.6.3
network.cookie.prefsMigrated true
privacy.sanitize.migrateFx3Prefs true

After upgrading to Firefox 10.0.2 there is no way to proceed to a website with an invalid security certificate. How do you proceed to these websites in the new release? The fault page only has a button that says "Try again."

Using Firefox 10.0.2 for Mac.
In trying to proceed to various websites (corporate such as dlnet.delta.com (expired certificate), government such as https://www.homeport.navy.mil/links/owa-navy-links/ ) with "invalid" security certificates, Firefox 10.0.2 does not have a button on the error page to continue on to the website. How can you do this using Firefox 10.0.2? I have not found any settings in Firefox preferences to enable this capability either.
Thx.

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

50.28.68.31:2087 uses an invalid security certificate. The certificate is not trusted because it is self-signed. The certificate is only valid for a id="cert_

50.28.68.31:2087 uses an invalid security certificate.
The certificate is not trusted because it is self-signed.
The certificate is only valid for <a id="cert_domain_link" title="new.thelifeincomegroup.com">new.thelifeincomegroup.com</a>
(Error code: sec_error_untrusted_issuer)

See https://support.mozilla.org/kb/Secure+Connection+Failed

Message for an invalid security certificate keeps popping up when I open firefox

"fvd.kallout.com: 443 uses an invalid security certificate
the certificate expired on 5/31/11
this could be a problem with the servers configuration or it could be someone trying to impersonate the server
if you have connected to the server successfully in the past the error may be temporary and you can try again later"
This is what opens on my screen every time I have opened Firefox today. If I hit "cancel" the window closes, but I do not know what it means or how to permanently clear it, or if someone is trying to use my system illegally.
Can you please tell me what my best next course of action is?
Thank you,
cemerrick

The "Fast Video Download" extension has been reported to cause this issue.
*Fast Video Download: https://addons.mozilla.org/firefox/addon/fast-video-download-with-searc/

Firefox (21.0) won't accept the security certificate for Twitter & won't let me add an exception.

My mother was having problems with her computer on the Internet and had to reset the modem. Problem was, I was on the Internet at the time using Twitter. She reset the modem, I thought everything was okay, but now Firefox isn't letting me access Twitter at all because of the security certificate. Here's the error message:
This Connection is Untrusted
You have asked Firefox to connect
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Normally, when you try to connect securely,
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If you usually connect to
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The certificate is only valid for gateway.2wire.net
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Window 8.1 update & invalid security certificate errors

I set up my new PC 2 days ago running Windows 8.1. I was able to visit all websites, including secure ones, w/no issues via Firefox. Last night, suddenly I was unable to access many secure websites. These include Google (Gmail) & Ilines (email). Here is a copy of the Google error:
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http://support.microsoft.com/kb/2965142/en-us#appliesto
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Thanks for the feedback cor-el. Here are the results:
1. Installed Kaspersky certificate per link= no change
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Just FYI, I get 2 different secure connection errors:
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Ilines: "Secure Connection Failed An error occurred during a connection to mail.ilines.net. Peer's certificate has an invalid signature. (Error code: sec_error_bad_signature)"

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Tigerbeetle.

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== I downloaded MS Word 8.5 and tried to register with Microsoft.

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Just launched a new site on Business Catalyst. When checking online for the first time I received the following warning in my browser " uses an invalid security certificate. The certificate is only valid for the following names: *.worldsecuresystems.com, worldsecuresystems.com. " is this normal?
Thanks,

Hi
Take a look to this thread, this should explain this behavior
Can I install my own SSL certificate for my domain?

Site name) uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

I am working with Firefox 35.0 I get the security certificate error message of site name) uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer).
This happens on each page that I go to. I can pull the page up with no problem with Explorer. Please Help. I don't have any security software that would be stopping or scanning SSL.

Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
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*Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
*Click the "View..." button and inspect the certificate and check who is the issuer of the certificate.
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If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab".
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This is weird! I've fixed my problem by entering an incorrect date on my computer, then returned it to the proper date, all is good now! Noticed in the message that the date was incorrect, so I checked my computer, it was o.k. It worked though!

Invalid Security Certificate (Gmail, Yahoo, Hotmail)___[SOLVED]

When I try to connect to a site with https, I get this error.
www.google.com uses an invalid security certificate.
The certificate expired on 05/03/2009 02:02 AM.
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I get this error on both a wired and wireless connection. I changed the router DHCP DNS to OpenDNS in an attempt to fix the problem, but no luck.
I have also rebuilt ca-certificates
cp -r /var/abs/core/ca-certificates ./; makepkg; sudo pacman -U ca-certificates-*.pkg.tar.gz
I am thankful for any reply, I would love to check my email.
Last edited by architech (2009-03-28 07:23:47)

architech wrote:
oops:P
To fix the problem =>
sudo date -s "%the proper date here%"
Or simply use ntp.

Igot error invalid security certificate every time i load page how can i ix it?

Igot error invalid security certificate every time i load page how can i ix it?
http://image.ohozaa.com/view/6qb2o

Yes your calendar date is wrong as you have it set as January 28, 2554 as per your image.
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/windows_date_change_date.mspx?mfr=true

Invalid security certificate for all websites on Mac (sec_error_unknown_issuer)

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