This Connection is Untrusted error
I can no longer use Firefox, and I don’t know why.
I’ve been having issues with capital one banking site for the last 3 weeks since they switched to a new platform. I was using Firefox, and last night and the rep told me to try a different browser. When I said I would try from Explorer, she said NO, it’s not safe. We have an email from HOMELAND SECURITY telling us to advise customers not to use versions 6-11 due to a ZERO DAY VULNERABILITY (I forget exactly that means, but it’s bad).
Anyway, she had me install Chrome, which didn’t work either. However, when I went to Firefox again, my home page was SUDDENLY the Firefox start page. I had 3 tabs as my home page before installing Chrome. When I tried to set those back up, almost every page I go to says “This Connection is Untrusted."
The only thing I could find online (using Chrome and Safari on Ipad) was an old post advising to check if it happened in safe mode and it did still happen. I tried UNINSTALLING Chrome (even though I don’t think that should have had anything to do with it, even though the timing is suspicious) and that DIDN'T HELP either.
The first time I got the error (online.surry.edu), I started to choose Add Exception, but then I was afraid to because it said “… someone is tampering with your connection…you know there’s a good reason…” I can’t even send this info as an email, so I’m typing it in Word and bringing it to send to you.
Any help you can give me would be GREATLY APPRECIATED! I really need to get back on my class site this weekend (and others, of course). Could installing Chrome actually have caused this issue?
Thanks
Chosen solution
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 free version of malwarebytes & adwcleaner.
Troubleshoot Firefox issues caused by malware
Read this answer in context 👍 1All Replies (7)
hello alawson1970, first please make sure that the date & time is set correctly on your system. if this doesn't solve the issue (or it is already set properly), a possible solution depends on different factors:
- what is the error code shown under technical details on the error page?
in case the error code equals sec_error_unknown_issuer, please attempt to add an exception on the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):
- which issuer information does the certificate contain?
thank you!
"This Connection is Untrusted" error message appears - What to do
Thanks for the info. I'm not at home now, but I have screenshots of the error and it’s the sec_error_unknown_issuer. I'm leery of clicking on the Add Exception (see original post about the scary terminology), but the link you provided says to try deleting cert8.db, so I’ll try that first when I get home. I don’t know if I made this clear before, but I wasn’t having this problem immediately before I installed Chrome. I was logged on the online.surry.edu and several others before I used Firefox to download the Chrome install file. During the install, it closed Firefox. Then, when I was finished with Chrome, I opened it back up and my homepages were gone. It was on the Firefox start page and every site with a log in gave me the untrusted connection. Also, the Chrome site used search.conduit.com (or something like that) as the homepage. I got that eliminated as the homepage and '''uninstalled it (and 3 others) '''that Chrome had apparently installed. Do you think one of these could have corrupted something in Firefox? I also read something about making sure Firefox wasn’t “going through a Proxy Server.”
this can commonly be caused by legitimate security suites but also by malware intercepting secure network traffic.
the most important thing to get to the bottom of the issue now is to find out the issuer of these untrusted certificates as it's shown in the screenshot from my prior reply. don't worry, you just have to go as far as you can see it on the screenshot - afterwards you can cancel all dialogs then no exception will be created and your configuration stays untouched...
Okay, I got the security certificate (see image). It says created by http://www.fiddler2.com and common name is DO_NOT_TRUST_FiddlerRoot.
I checked others and they say pretty much the same thing except the serial number and fingerprints vary.
Also, when I turned on the computer this morning, I noticed something during startup on the taskbar for a second called Proxy Client. I think it’s probably related to this, but I don’t know what that is or how to turn it off/get rid of it.
What should I do next?
Thanks
Chosen Solution
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 free version of malwarebytes & adwcleaner.
I removed BrowserSafeguard and ran Malwarebytes. It found 29 items and removed them and the problem seems to be fixed now. Thanks so much for your help.
great, thanks for reporting back!