FireFox Connection Trust Question

Hello Experts,

Can someone please explain why I keep getting the following error  message 'Connection is Untrusted' question in FireFox?

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helpfinderIT ConsultantCommented:
it means your browser does not trust the certificate which is on the webpage you are browsing. whyt it is not trusted is because it was issued by not trusted certification authority (issued by yourself, for example) or because the content of the certificate does not meet the domain - e.g. domain name on certificat is and certificate is used on

I can see on your printscreens you are browsing your LAN so maybe som NAS or something like that and in this cas it is OK because you can trust your own certificate. if you see this when browsing public web like email, internetbanking, paypal etc then you should not login for example because it could be a phishing or so.
cpatte7372Author Commented:

I keep on getting the same message even after I click 'Confirm Security Exception'. I don't get the same message with my other identical device.

helpfinderIT ConsultantCommented:
because you do not have ticked "Permanently store exception" - I can see it is greyed out.

try to navigate to FF home folder
and find and rename (I prefer rename instead od felete because then you can revert changes) cert_override.txt and cert8.db (I would rename them to cert_override_old.txt and cert8_old.db). Then restart Firefox and check if the exception is clickable now

if this is not working you can try this guide from here

1 - Edit -> Preferences
2 - Advanced tab/button
3 - Encryption tab
4 - View Certificates
5 - Servers tab
6 - [find cert]
7 - Delete button
8 - OK to confirm delete
9 - OK to close Certificate Manager
10 - Close to close Preferences
11 - Add Exception button
12 - Confirm Security Exception button grayed out?
If not, you are done (jump to step 22); if not, continue to step 13.
13 - Cancel Add Security Exception
14 - Edit -> Preferences again
15 - Privacy tab/button
16 - clear your recent history link
17 - Time range to clear (I suggest Everything)
18 - Unselect all; Select Cache [only]
19 - Clear Now button
20 - Close to close Preferences
21 - Add Exception
22 - Unselect Permanently store this Exception
23 - Confirm Security Exception

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cpatte7372Author Commented:

I going to try your suggestion, but I'm curious why it doesn't happen with my other devices?
helpfinderIT ConsultantCommented:
maybe you have ticked that "Permanently store exception" on other devices when browsed 1st time?
cpatte7372Author Commented:
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