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Mac Firefox secure connection failed

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Last Modified: 2019-10-08
Hi,
  Just installed latest and the greatest Chrome and Firefox on our test Mac workstation.
Both the Safari and the Chrome browsers can access external sites (e.g. Google.com, espn.com) just fine, but the Firefox browser keeps showing the following error when accessing external sites (screenshot attached).

  Under Firefox’s Options-> General -> Network Settings:
    I’ve tried manually entering the Proxy server setting as well as selecting the “Use System proxy settings
     The Test Mac never had Chrome or Firefox installed prior to today.

Any assistance is greatly appreciated .
firefox10-7-19.jpg
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David FavorFractional CTO
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Distinguished Expert 2019

Commented:
Provide a clickable URL (as text, not image).

1) Looks like the problem might be the query parameter... or...

2) Might be some other problem like a DNS Ad Blocker... because... Google redirects www.google.com to google.com in all cases.

Your images shows the www.google.com has been preserved, so seems like local DNS might by hijacking the request.

Try posting the output of following commands... The NS records should match + likely you'll be returned a different A record...

imac> dig +short google.com ns
ns2.google.com.
ns4.google.com.
ns1.google.com.
ns3.google.com.

imac> dig +short google.com a
172.217.9.142

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eridzoneIT Administrator
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Commented:
How is Safari going?

Have you tried Private mode browsing in firefox to see if that helps??
David Johnson, CDSimple Geek from the '70s
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Distinguished Expert 2019

Commented:
do you have a NGFW that is doing deep packet inspection? If so you need to add it's certificate to the root certificate providers in Firefox (firefox uses its own RCP"s
  1. Select Advanced.
  2. Select the Encryption tab.
  3. Click View Certificates. The browser displays the Certificate Manager dialog.
  4. Navigate to where you stored the certificate and click Open.
  5. Click Import. The browser displays the Downloading Certificate dialog.

Author

Commented:
eridzone, I tried Firefox in Private Mode and it's opening external sites, what does that mean? Extensions/Add-on?

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