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I allowe firefox to update today (MacOS 10.11.6, Firefox 61.0.2, 64-b it) and can no longer browse - Firefox claims all certs are bad, even Mozilla's cert.

  • 8 svar
  • 1 har detta problem
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  • Senaste svar av jssimonson

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I let Firefox upgrade this morning to 61.0.2, 64-bit on MacOS 10.11.6. Now it claims all certs are bad (even Mozilla's certs) with the following type of message "Your connection is not secure. The owner of www.mozilla.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. Learn more… Report errors like this to help Mozilla identify and block malicious sites"

I either add exceptions (which seems wrong) or I cannot browse to any site

I let the upgrade occur because firefox claimed it had a slow start up and wanted to fix that.

I let Firefox upgrade this morning to 61.0.2, 64-bit on MacOS 10.11.6. Now it claims all certs are bad (even Mozilla's certs) with the following type of message "Your connection is not secure. The owner of www.mozilla.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. Learn more… Report errors like this to help Mozilla identify and block malicious sites" I either add exceptions (which seems wrong) or I cannot browse to any site I let the upgrade occur because firefox claimed it had a slow start up and wanted to fix that.

Vald lösning

A followup - I did find how to tell AVG to not do the man-in-the-middle checks, and that does allow Firefox to reach sites I've used for years (Mozilla, MSN, F1, etc.)

A good and fast support system - thanks to all that helped.

Läs svaret i sitt sammanhang 👍 0

Alla svar (8)

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hi, first please make sure that the date, time & timezone are set correctly on your system. if this doesn't solve the issue (or it is already set properly), a solution depends on the individual circumstances:

  • what is the error code shown when you click on advanced on that error page?
  • please also give us more information about the error by clicking on the error code, copying the text to the clipboard and then pasting it here into a reply in the forum like shown in the screenshot.

thank you!

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The error message is "SEC_ERROR_UNKNOWN_ISSUER", and if you click on that you get the cert displayed and 'Peer’s Certificate issuer is not recognized. '

Time is correct (set via ntp I suspect, and matches other time sources (e.g., a clock set by radio signal). Timezone (EDT) is also correct.

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jssimonson said

The error message is "SEC_ERROR_UNKNOWN_ISSUER", and if you click on that you get the cert displayed and 'Peer’s Certificate issuer is not recognized. '

Can you share the large block of gibberish (encoded certificate)? This may help identify a "man in the middle" of Firefox's connection to the site.

In anticipation, I'll also give you this link: How to troubleshoot security error codes on secure websites.

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Sure, and thanks for the help. The AV product I use on that Mac is AVG 18.3. I've initiated a full scan.

Here's the block of info for the cert: www.mozilla.com uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported.

Error code: SEC_ERROR_UNKNOWN_ISSUER https://www.mozilla.com/


Peer’s Certificate issuer is not recognized.


HTTP Strict Transport Security: false

HTTP Public Key Pinning: false


Certificate chain:



BEGIN CERTIFICATE-----

MIIJbDCCCFSgAwIBAgICC0IwDQYJKoZIhvcNAQELBQAwYjELMAkGA1UEBhMCQ1ox

DTALBgNVBAgMBEJybm8xDDAKBgNVBAoMA0FWRzEdMBsGA1UECwwUU29mdHdhcmUg

RGV2ZWxvcG1lbnQxFzAVBgNVBAMMDkFWRyB0cnVzdGVkIENBMB4XDTE4MDUxODAw

MDAwMFoXDTE5MDkyMDEyMDAwMFowgYsxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpD

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eNH18AEUPpM4ZiEB/Bm1+Q==


END CERTIFICATE-----
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Thank you for sharing the certificate. It shows that the certificate was issued by "AVG trusted CA" instead of the true certificate issuer, an indication that your AVG security software is intercepting your web browsing.

A new installation of Firefox isn't set up to work with any "man in the middle" security suite like AVG, Avast, Bitdefender, ESET, or Kaspersky. What can you do? Either:

  • The security software will set up Firefox automatically at your next system startup or by using a button in the software's interface (simplest)
  • You can disable the "man in the middle" feature (see: How to troubleshoot security error codes on secure websites -- the new AVG is similar to Avast); this may improve performance by removing one level of filtering
  • If necessary, you can manually import AVG's signing certificate into Firefox's certificate store
  • You can set Firefox to trust certificates that MacOS X collects
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Very helpful, thanks much. The simplest solution you recommend, are you saying restart the Mac? Am I understanding the problem correctly, it is AVG interfering with Firefox's certs? I've will have to look into AVG docs, I don't see an obvious way to disable the man-in-the middle feature. I'll look into the other methods as well (importing the AVG signing cert). Setting Firefox to trust the collected certs - is that a good solution?

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jssimonson said

The simplest solution you recommend, are you saying restart the Mac?

It might work. AVG/Avast usually can set up Firefox automatically, but I don't know exactly what triggers it.

Am I understanding the problem correctly, it is AVG interfering with Firefox's certs? I've will have to look into AVG docs, I don't see an obvious way to disable the man-in-the middle feature.

AVG now works similarly to Avast. Possibly it's browser interception is also called the Web Shield, but I haven't looked at the docs.

I'll look into the other methods as well (importing the AVG signing cert). Setting Firefox to trust the collected certs - is that a good solution?

I think it's better to have Firefox use its own certificate store if you can.

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Vald lösning

A followup - I did find how to tell AVG to not do the man-in-the-middle checks, and that does allow Firefox to reach sites I've used for years (Mozilla, MSN, F1, etc.)

A good and fast support system - thanks to all that helped.