This connection is untrusted while opening gmail, facebook

As of this morning i have not been able to open gmail or facebook with firefox.
1. I have not made any OS changes or antivirus changes since yesterday.
2. I always set my cache and history to be cleared when i close firefox.
3. I uninstalled and reinstalled firefox a few times (completely following the instructions on the mozilla page where the hidden roaming firefox directory is to be removed).
4. I reverted back to Firefox 32.0.3 and it did not solve the problem.
5. I ran malwarebytes and Microsoft Forefront Endpoint Protection and there are no viruses or malware detected.
6. I am running Win 7.
7. I can open these sites without a problem on Chrome or IE.
8. Google.com opens fine and i do a search for gmail through google.com and it displays the "connection untrusted message". Details are below:
This Connection is Untrusted
You have asked Firefox to connect securely to mail.google.com, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
mail.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)

Thanks for your input. My issue got fixed. It seemed to be a proxy issue. Once this variable was set in about:config to the proxy name I was again able to access all the above mentioned sites: ''network.negotiate-auth.trusted-uris''. The value of this variable was '''thenameofmycompany.com'''.
I don't know what happened to change this overnight when i did not update the browser but somehow this was the issue. Also looks like when i downloaded and installed firefox this variable did not get set automatically.

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Google and Facebook show 'This connection is untrusted'; other sites are fine. What's wrong?

Hi there,
Yesterday I could log into sites like Facebook, Google and others fine, and now when I try to log in to them it comes up with the following message:
'This connection is untrusted.
www.facebook.com uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)'
I managed to get onto other sites like BBC News and Outlook without any error messages. Strangely, Google Images comes up fine from a bookmarked link, but then goes to untrusted as soon as you search for anything. I've seen this message come up on the support site before, and have tried the following suggestions:
-Cleared the cache
-Cleared cookies (including individual page cookies)
-Deleted internet temp files
-Cleared Downloads folder in Firefox
-Opened Firefox in Safe Mode to rule out add-on problems
-Chosen 'No proxy server' in the Network options
-Reloaded the page using Ctrl-Shift-R
-Reloaded the page from a History tab when it was working (yesterday)
-Used the bookmarked link
-Typed the link in directly
-Reset Firefox
-Deleted the 'cert8' file in the Firefox folder
-Synchronised system time and date with time.windows
-Full antivirus scan on computer (which showed nothing)
-Checked web security settings in Bullguard (no interference there)
-Uninstalled/reinstalled Firefox
I managed to get Google working eventually, then the Mozilla Support pages said they were untrusted, so I'm currently posting from Chrome, which is becoming my backup browser more frequently :(
Apologies for the lack of proper Troubleshooting info! Here's the best I can do:
Application Basics
Name: Firefox
Version: 27.0.1
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: BullGuard Safe Browsing
Version: 2.1
Enabled: true
ID: antiphishing@bullguard
Important Modified Preferences
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.disk.smart_size_cached_value: 358400
browser.places.smartBookmarksVersion: 4
browser.sessionstore.upgradeBackup.latestBuildID: 20140212131424
browser.startup.homepage_override.buildID: 20140212131424
browser.startup.homepage_override.mstone: 27.0.1
dom.mozApps.used: true
extensions.lastAppVersion: 27.0.1
gfx.direct3d.last_used_feature_level_idx: 0
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1394963403
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
Graphics
Adapter Description: Intel(R) HD Graphics 4000
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter RAM: Unknown
Device ID: 0x0166
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.16384)
Driver Date: 10-1-2013
Driver Version: 10.18.10.3316
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 10
Vendor ID: 0x8086
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: false
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.2
Version in use: 4.10.2
NSS
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSSMIME
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSSSL
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSUTIL
Expected minimum version: 3.15.4
Version in use: 3.15.4
OS: Windows 8.1 x64
Any idea what else I can try? Facebook I'm not too worried about, but I need Google for work and pretty much everything else!
EDIT: I gave up, went and had a pint of tea and when I came back everything seemed to be alright again! Not sure what the hell happened. Does anyone else have any idea why this comes up, or is it just something that happens now and again?

this is similar to your question.just go-through it or if you stuck then reply back for more info on this problem : https://support.mozilla.org/en-US/questions/974711

I just downloaded the new version of Firefox and now every site I used to use such as Facebook, Twitter, and Youtube show "This Connection Is Untrusted"

I just downloaded the new version of Firefox and now every site I used to use such as Facebook, Twitter, and Youtube show "This Connection Is Untrusted". Even when I do accept the risks the site no longer looks the way it's looked for years. Twitter doesn't even give me the option to accept the risks at all and shows this error (Error code: sec_error_unknown_issuer). I've tried resetting Firefox, I've checked the time and date, and I've removed and added Firefox to see if that would work. Nothing seems to be working so I can see the sites the way they normally would be instead of "coded". Can anybody help me please?!!! Thanks

ok, unfortunately the fiddler2.com issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
reference: https://support.mozilla.org/en-US/questions/982532#answer-520145
afterwards, run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner].
[[Troubleshoot Firefox issues caused by malware]]

I am getting "this connection is untrusted" error messages from Firefox for Desktop when I try to log into certain websites, such as Facebook. Why?

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Hi,
Please check the time/date on the PC. The ideal setting would be to '''Automatically synchronize ...''' in Date and Time > Internet Time.

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This Connection is Untrusted
You have asked Firefox to connect securely to psappprd1.is.wfubmc.edu:8002, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is
trying to impersonate the site, and you shouldn't continue.
psappprd1.is.wfubmc.edu:8002 uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)

this problem when i change my motherbord , Happened.
i solved this , by set the time & date in windows & '''mainbord time in bois''' .
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'This Connection Is Untrusted' Won't Go Away

I have been using Firefox for a while, but then suddenly some websites came up with 'This Connection is Untrusted'. Whenever I got this, I added an exception and everything was fine. All of a sudden, when I tried accessing a page on Facebook, the message came up again, without the option to add an exception. I've been searching through google for an answer, but haven't found anything that worked. It's really annoying.
Here's the full message I get:
This Connection is Untrusted
You have asked Firefox to connect securely to www.facebook.com, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be veri
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
Technical Details
www.facebook.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
Check out why the site is untrusted and click "Technical Details" to expand this section.
If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
*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.
You can see more Details like intermediate certificates that are used in the Details pane.
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".
*Note that some firewalls monitor (secure) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
*Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

Getting sec_error_unknown_issuer while opening gmail. What to do?

While opening Gmail on firefox, I am not able to open it as I am getting Untrusted Connection with an error message "sec_error_unknown_issuer". There is no option to add exception also. What to do? I am able to open gmail on other websites .

Open this chrome URI by pasting or typing this URI in the location/address bar to open the "Add Security Exception" window and check the certificate:
* chrome://pippki/content/exceptionDialog.xul
In the location field type/paste the URL of the website
* retrieve the certificate via the "Get certificate" button
* inspect the certificate via the "View..." button to see the issuer

Every time I try to log into ANY website that is secured, I get an error message "This connection is untrusted."

The error message is:
This Connection is Untrusted
You have asked Firefox to connect securely to www.facebook.com, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
www.facebook.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)
If you understand what's going on, you can tell Firefox to start trusting this site's identification. Even if you trust the site, this error could mean that someone is tampering with your connection.
Don't add an exception unless you know there's a good reason why this site doesn't use trusted identification.
Steps I have take so far:
Verified that system clock is correct
Cleared all cache, history, cookies, etc.; didn't help
Started Firefox in Safe Mode; didn't help
Disabled all Firefox extensions; didn't help
uninstalled and reinstalled Firefox using Control Panel; didn't help
Ran Microsoft Safety Scan for malware; nothing was found
Other information:
This problem exists ONLY in my user profile and ONLY in Firefox. All 5 other users can run Firefox with no problem. I can run IE and Chrome with no problem.
Problem exists in ALL secured (https) sites.
I use Avast and Windows Firewall. Had never heard of ESET or BitDefender before searching these forums.
A lot of the sites don't give me the option to Make an Exception. The two that I tried to make exceptions for, still wouldn't open.
Run Windows 7 64-bit

unfortunately the fiddler2 issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
 reference: https://support.mozilla.org/en-US/questions/982532#answer-520145
afterwards, run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner].
[[Troubleshoot Firefox issues caused by malware]]

Trying to completely disable "this connection is untrusted" dialog

I'm trying to completely disable the "this connection is untrusted" dialog. I've had this issue since 3.5 when the security model was changed. There used to be a plugin that reduced the amount of time it took to get through this dialog, but it stopped working with 4.0.
Issues:
I am a systems administrator that managages 1000's of servers & devices. A large number of these have internal websites, and they can be replaced/change frequently (HP ILO's, temporary dev websites, switches, etc.). the frequency of the turnover and the effort to create and assign a certificate to each of these websites would cause a lot more effort then going through the dialog choices. however, the dialog choices frequently slow my work down on a regular basis. Adding an excemption for each website would not work due to the frequently changing nature of my environment.
So to sum up:
I want to completely and utterly turn off/remove the "this connection is untrusted" dialogs from my Firefox. It will save me (and others I would imagine) time and effort to simply disable this dialog completely. I don't care how obscure it would be to get to work, as long as it's an option and it only has to be done once.

'''I am so tired of firefox telling me "This Connection is Untrusted"!!!!!!!!''' I'm tired of having to add exceptions, I'm tired of the extra tiny lag time of loading while it checks sites, I'm tired of typing the URL I want into the URL window only to look up to see that the lag time has now caused my cursor to stop typing in the URL window and has now started searching in my Google homepage halfway through my typing!!
Firefox, '''GIVE US A CHOICE of whether we want secure browsing on or off''' or I am OFF YOU and onto another browser!!!~~!!~!~!!!~!!! Quit forcing things on us like Facebook does with no options to opt in or out if we so choose.

This connection is untrusted with Error code: sec_error_unknown_issuer.

Hello,
When I try to open G-Mail & twitter and some other trusted websites, I got the following warning "This Connection is Untrusted" with Error code: sec_error_unknown_issuer.
For most of the site, I can bypass by clicking « I understand the risk » but this is a bummer but for Gmail and Twitter, there is no other button than "Get me out of here"
When I go through « about:support » and « reinitialise » system, I no longer have the problem, but not only it erases all my personnal set-up but the problem always come back when I restart my system
Date and time are set right.
I have also tried to reinstall completely FIREFOX to no avail
I am using McAfee Total protection 2014 & Firefox 31.0 on Windows 7 64 bits.
I have had this problem for the last 5 days and only Firefox.
Other Browser ( IE8.0) is working fine
I have searched for solutions but they all failed -
Deleting cert8.db did not solve the problem either
How do I solve this Problem?
Thanks and Regards

You can check the connection settings.
*Tools > Options > Advanced > Network : Connection > Settings
*https://support.mozilla.org/kb/Options+window+-+Advanced+panel
If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See "Firefox connection settings":
*https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can
Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: http://windows.microsoft.com/en-us/windows/using-defender
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Cannot access any https sites, clock is OK, get This Connection is Untrusted error message.

All works OK on Chrome and IE, but Firefox just suddenly stopped access to https sites yesterday, e.g. Google, Facebook and Linkedin. Non secure http sites are OK though. "This Connection is Untrusted" is the error message and technical details are www.google.com.tw uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer). I've tried all the Mozilla support suggestions, clock (which was always correct), reset Firefox, etc. No change so far, I hope you can help fix this issue.

Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
Check out why the site is untrusted and click "Technical Details to expand this section. If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
*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.
You can see more Details like intermediate certificates that are used in the Details pane.
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".
*Note that some firewalls monitor (secure) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
*Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

Every website that I try to access, I get this mesage ''This Connection Is Untrusted". Please advise.

Every website that I try to access, I get this mesage ''This Connection Is Untrusted". I tried to add exceptions, but that didn't work.

Hello,
This is generally not a good thing if you are seeing this message for all websites. Can you please check if you are seeing this issue if you open the browser in Safe Mode (instructions below).
Also, request you to scan your computer for any malware to ensure that there is no issue with some malicious software running on it.
<hr>
'''Safe Mode'''
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
<hr>
'''Malware scan'''
Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.

I am so tired of firefox telling me "This Connection is Untrusted"!!!!!!!!

'''I am so tired of firefox telling me "This Connection is Untrusted"!!!!!!!!''' I'm tired of having to add exceptions, I'm tired of the extra tiny lag time of loading while it checks sites, I'm tired of typing the URL I want into the URL window only to look up to see that the lag time has now caused my cursor to stop typing in the URL window and start searching in my Google homepage halfway through my typing!!
Firefox, '''GIVE US A CHOICE of whether we want secure browsing on or off''' or I am OFF YOU and onto another browser!!!~~!!~!~!!!~!!! Quit forcing things on us like Facebook does with no options to opt in or out if we so choose.

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 file cert8.db to cert8.db.old in the Firefox Profile Folder to remove all intermediate certificates that Firefox has stored by visiting secure websites. 
If that helped to solve the problem then you can remove the renamed file cert8.db.old unless you have user certificates that you may want to export first and import them in the new file. 
Otherwise you can restore the certificates by renaming (copying) the file back to cert8.db 
Firefox will automatically store new intermediate certificates when you visit websites that send them.

"this connection is untrusted" keeps coming up for paypal

On going from e-bay to paypal I'm contently getting "this connection is untrusted" and there is no place to go to fix it.

Hi,
Please also try this: https://www.paypal.com/
If the problem persists, you can also consider the [https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems Reset Firefox] feature via '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information'''.
(To revert to the previous profile you were using, close the new profile (i.e. exit Firefox), start Firefox and choose the '''Default User''' profile. While the [https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Profile Manager] is open, you can also delete the newly reset profile (the one containing random numbers), or the former profile, as the case may be). If the reset is okay, it would be a good idea to delete the old profile as otherwise it would be left intact with the previous data until deleted.
[https://support.mozilla.org/en-US/kb/Managing-profiles Managing profiles]
[https://support.mozilla.org/en-US/kb/Profiles?s=profile&r=2&e=sph&as=s Profiles Howto]

This connection is untrusted while opening gmail, facebook

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