Why does Firefox send scary warning "This Connection is Untrusted" for URLs that I know are OK?

Example: I try to log on to renew automobile registration at www.DMV.state.pa.us or other innocuous locations and I receive that scary warning. So I log in on Explorer on my PC and the website works OK. Am I doing something wrong?

as far as I know, you are not doing anything wrong. I get the same message for some government managed pages. I believe it has to do with who furnishes their certificates.
Firefox has a article that explains security certificates here:
http://support.mozilla.com/en-US/kb/This%20connection%20is%20untrusted

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Why am I getting the message 'this connection is untrusted' when trying to access iCloud through Mozilla Firefox?

I use Mozilla Firefox and have never had difficulty before, but today I got 'this connection is untrusted' when trying to open iCloud. There was no option to override this.
The Technical Details said:
www.icloud.com uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)
Help!

Clear your history/cookies and stuff like that on Firefox and then retry. If that doesn't work try restarting the computer or accessing iCloud via Google Chrome or Safari for the time being. I feel your pain, I love Firefox.

Why am I getting the error "This connection is untrusted" in Firefox on my new computer?

Many familiar sites are giving me an error relating to certificates. See message below:
"This Connection is Untrusted
You have asked Firefox to connect
securely to www.xxxxxxxxxxxx.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."
The same sites are still working perfectly on an older computer without these issues. They also work in other browsers, but Firefox is my default.

As there have been no further responses to this thread, I've finally marked Google Chrome as my default browser on both computers.

Ugent help - Every time i go to a secure website firefox latest version says This Connection is Untrusted. This was never there before and now its appearing

Every time i go to a secure website using firefox latest version i get an error saying "This Connection is Untrusted" This was never there before and now its appearing. My computer clock and date is correct and i have tested out all plugins that they are updated. Also did a scan on all viruses and spyware nothing there any help please.

Sorry, I didn't look at all the images.
You can see that the certificate is issued by your security software (Firewall): ESET SSL Filter CA 
So you will have to disable that filter or install the ESET root certificate that chains to that certificate.

The warning ' This Connection is Untrusted' keeps coming up when I try to connect to a web site.

The message. This Connection is Untrusted' keeps coming up when I try to connect to a web site.

Make sure the date and time is set correctly.
Open System Preferences > Date & Time then select the Date & Time tab.
Select: Set date and time automatically
Then select t he Time Zone tab.
Select: Set time zone automatically using current location
Quit and relaunch Safari to test.

"This connection is untrusted" for any website I try to visit

Trying to access any website and I get the "this connection is untrusted" error come up.
Sites like the FireFox addons, Facebook, Tumblr, etc etc.
I've tried adjusting my date and time (although it already is on the correct date and time..) and still, nothing.

Example:

After applying cure, why does Firefox still, stubbornly, make unrequested connections?

After meticulous care to follow the guides on the support link titled "Firefox makes unrequested connections" [... http://support.mozilla.com/en-US/kb/Firefox+makes+unrequested+connections?s=firefox+is+seeking+unrequested+website&as=s ...], Firefox is still trying to contact obscure sights like:
iy-in-f104.1e100.net 
yw-in-f121.1e100.net 
iy-in-f103.1e100.net 
The above resolve to google. Yet I am not going to google and do not use the default search provided by Mozilla or Firefox browser. What is causing this browser to go to google, even after I thought I had, several times, performed the cure to stop it from accessing un-requested websites in the back-ground?
Firefox is acting mischievously, because it does this without being told to do that, and after I have asked it to stop. When it does go, it does not post any information on my browser telling me what it is doing.
After much effort to get it to stop, I consider this to be a nuisance that it is stubborn and acts on a hidden code to defeat my requests and actions trying to prevent it. This is the same behavior as malware and viruses that dial back to a location, do not announce what it is doing, and will not stop, after many hours of effort trying to instruct (reverse coding to get) it to stop.
I have now spent about 5-6 hours trying to figure what is the cause, and as such, it can be categorized as time wasted as when dealing with malware, that does not inform the end user what it is going to do prior to installation nor announce it, as it is being done, in the background.
Sometimes Firefox performs a hiccup and tries to change my update settings back to a condition of seeking to update itself or update its addons or updates its search (all options under the updates tab). Furthermore, Firefox has acted on routine of once or twice a month to change from "asking me what I want to do with updates," to "install automatically." Many times in the last 6 months I have seen it was trying to executive a program of updating, when it was not authorized to do such a thing, and was there to cancel this execution-sequence, if not too late. In this 6 to 7 instances, I have been prompted to go back and observe if Firefox is changing my settings by executing hidden code or back door code. In each instance all my update settings have been changed.
I have to go back inside the browser options, and deselect all the updates and also change from "install automatically" to "ask me what I want to do." This is even more curious because, such items were set to "false" via about:config as per instructions in the support link above. Have double checked addons, to make sure they are not trying to update.
In conclusion, this is obviously not a bug, as it is so deliberate and happens on some routine. It seems to a happen irregardless of what "version" or update is being used; including many updated versions since Jan 2010. Also what ever it is, an execution of code or backdoor to trigger same, it is not described in the readme file that comes with firefox.
So how about the programmers of Firefox stop belittling us by employing the same gimmicks as malware and tell us what is up with this: seeking unrequested websites and not announcing that it is occurring, when it is occurring.

Was able to edit original post. (Thank you.)

Firefox says this connection is untrusted for every single site! HELP!

Every website that I have visited, says the connection is untrusted. This is getting extremely frustrating. Help will be greatly appreciated!.
Here is my firefox info:
"application": {
"name": "Firefox",
"version": "26.0",
"userAgent": "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0",
"supportURL": "https://support.mozilla.org/1/firefox/26.0/WINNT/en-US/"
"modifiedPreferences": {
"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.startup.homepage_override.mstone": "26.0",
"browser.startup.homepage_override.buildID": "20131205075310",
"extensions.lastAppVersion": "26.0",
"network.cookie.prefsMigrated": true,
"places.history.expiration.transient_current_max_pages": 73687,
"privacy.sanitize.migrateFx3Prefs": true
"graphics": {
"numTotalWindows": 1,
"numAcceleratedWindows": 1,
"windowLayerManagerType": "Direct3D 10",
"windowLayerManagerRemote": false,
"adapterDescription": "AMD M880G with ATI Mobility Radeon HD 4250 ",
"adapterVendorID": "0x1002",
"adapterDeviceID": "0x9712",
"adapterRAM": "256",
"adapterDrivers": "atiu9p64 atiuxp64 atiu9pag atiuxpag atiumdva atiumd6a atitmm64",
"driverVersion": "8.770.2.1000",
"driverDate": "9-19-2010",
"adapterDescription2": "",
"adapterVendorID2": "",
"adapterDeviceID2": "",
"adapterRAM2": "",
"adapterDrivers2": "",
"driverVersion2": "",
"driverDate2": "",
"isGPU2Active": false,
"direct2DEnabled": true,
"directWriteEnabled": true,
"directWriteVersion": "6.1.7601.17514",
"webglRenderer": "Google Inc. -- ANGLE (AMD M880G with ATI Mobility Radeon HD 4250 Direct3D9Ex vs_3_0 ps_3_0)",
"info": {
"AzureCanvasBackend": "direct2d",
"AzureSkiaAccelerated": 0,
"AzureFallbackCanvasBackend": "cairo",
"AzureContentBackend": "direct2d"
"javaScript": {
"incrementalGCEnabled": true
"accessibility": {
"isActive": false,
"forceDisabled": 0
"libraryVersions": {
"NSPR": {
"minVersion": "4.10.2",
"version": "4.10.2"
"NSS": {
"minVersion": "3.15.3.1 Basic ECC",
"version": "3.15.3.1 Basic ECC"
"NSSUTIL": {
"minVersion": "3.15.3.1",
"version": "3.15.3.1"
"NSSSSL": {
"minVersion": "3.15.3.1 Basic ECC",
"version": "3.15.3.1 Basic ECC"
"NSSSMIME": {
"minVersion": "3.15.3.1 Basic ECC",
"version": "3.15.3.1 Basic ECC"
"userJS": {
"exists": false
"extensions": [
"name": "AVG Security Toolbar",
"version": "17.2.0.38",
"isActive": false,
"id": "avg@toolbar"
"name": "GreatArcadeHits Add-on",
"version": "1.0.0",
"isActive": false,
"id": "{B21F5E31-B8E8-41CD-B74C-168A71A10E49}"
}

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
*http://kb.mozillazine.org/Error_loading_websites
Do a malware check with some 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: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*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

This Connection is Untrusted for Outlook mail

I get this error message anytime when I try log in on mail.live.com using my email [email protected] but when I use secondary account email address I can log in without any errors. Nothing has change exempt my email addresses. I have tried all other fixes which have been posted to fix this problem. When I look into more about the error, I notice Firefox was trying to log in to my yahoo mail account, which is mail.yahoo.com. Why is Firefox trying to log in on yahoo when I typed in live.com URL.
This just started couple weeks ago, up until then I could log in to my live.com account. No virus or malware or time wrong. I get the like error message with IE and Chrome. Where is problem and how to fix??

When you log in to a Live Mail (Hotmail, Outlook.com, etc.) account, you should always be on this domain:
https://login.live.com/login.srf
Then the site will redirect to a particular server, such as
'''col125'''.mail.live''.''com
It's possible that your accounts are on different servers and that one of them has a certificate Firefox finds disagreeable while the other one is fine. If the problem is with the following server, please see the linked threads for suggestions:
'''bay174'''.mail.live''.''com
* [https://support.mozilla.org/questions/1033421 I get the message "Untrusted Connection" just with Firefox; not with IExplorer]
* [https://support.mozilla.org/questions/1019979 Hotmail untrusted connection,why?]

Why does Firefox say "This Connection is Untrusted" for most websites?

Firefox tells me the connection isn't trusted for pretty much every site I attempt to go to. I can't bypass it and I have tried everything I read in the support articles, changed settings, resetting and restarting etc. Nothing works. Please help!

Check the date and time 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.
* Name associated with your security software, such as ESET, BitDefender, etc.
* FiddlerRoot (usually indicates unwanted software being installed named similarly to BrowserSafeguard, BrowserSafe, SafeGuard; see [/questions/982532#answer-520145])
* Sendori (indicates unwanted software from Sendori; see [/questions/861138])

Why does firefox crash when the internet connection is lost?

We have been having trouble with our internet connection recently and firefox crashes whenever the connection is lost, but this didn't used to happen, so I was wondering why this was happening.

If there is any intermittent issues or connection is lost you will revert to the menu, regardless. The 'apps' are fed via server and there is nothing stored on the unit, it simply caches when you are online.
As for the initial wait time. That could be due to ISP throttling, interference, using another DNS
Note: This is a user forum, there is no service provided here by Apple. If you wish to get official tech support you need to contact them.

Why does firefox send these two messages several times a day?

'''firefox is in offline mode.'''
[i never check offline mode. i don't understand]. this occurs at least twice a day, and sometimes more.
'''The connection was reset.'''
'''The connection to the server was reset while the page was loading.''
win xp pro, sp3, lenovo thinkpad x201, firefox 3.6.10, avg 9.0.8.62

Hello @susan649,
Welcome to the HP forums.
I understand that you are concerned about the amount of updates being sent to your Photosmart 6520.
I would like to help.
That is actually a lot more then normal. One every few weeks sure. four or more a day? Nope, not normal.
Perhaps the same update is not updating properly so it tries again later.
I would try setting a manual DNS.
The following post by happytohelp01 has steps and screen shots to perform this.
Efax 7510 still won't work after turning off/on ePrint several times
The screen shots are for an Photosmart 7510, but the steps are the same.
For the Manual Preferred DNS Server please use 8.8.8.8 and for the Alternate Preferred DNS server please use 8.8.4.4. These are Google’s public DNS servers. If you find that those DNS settings don’t work, some customers have had success using the Level3 DNS servers. I have included About.com’s Free & Public DNS Servers.
If your printer is still doing an abnormal amount of updates, please call our Cloud Services at 855-785-2777.
If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Aardvark1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!

Why does Firefox send me back a few pages when I attempt to type into a text box???

I am sick and tired of this insane bug. It affects me on a daily basis. 20% of the time I attempt to type anything into any text box, for every keypress, Firefox will treat them as requests to 'go back' and it launches me several pages backwards through my browsing history in the tab. I then I have to skip forward and attempt filling it in again. It usually works after 1-2 attempts but like i said this is happening 20% of the time on text input forms, especially FARK.com.
== This happened ==
A few times a week
== Year or two ago

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

Problems with receiving error message "This Connection is Untrusted" for any https sites. On version 17.0.1 of firefox. IE does not get error.

whenever I go to an https site, I get this error message. My other browsers are not having the same issue. I deleted cert8.db as one site suggested. Stopped using firefox due to this issue. example: www.comcast.net, once I sign into email, I get this error message. Amazon.com - same issue. So, these are very common sites. This only started in past two weeks.

Does updating to Firefox 18 (which comes out today) help? It fixed a few issues with certificates.

Why is firefox sending so many outbound connections, close to 200.

When I first open Firefox, everything slows down and/or stops. When I check my firewall, it occasionally shows as many as 215 outgoing connections, as much as 95% of which are from Firefox. The OS is Win Vista Home Edition. The firewall is Comodo.

Hi,
Please check if this repeats in [https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode.] Safe Mode disables the installed extensions and plugins in '''Tools''' ('''Alt''' + '''T''') > '''Add-ons'''.
Please also note that Firefox may open multiple connections per server, so having many tabs open could also be a reason. Firefox may also prefetch content from links in a page while idle.

Why does Firefox send scary warning "This Connection is Untrusted" for URLs that I know are OK?

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