thunderbird does not connect to mozilla, nor can firefox gets the same message, and cannot add exception
Secure connection failed
live.mozillamessaging.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: <a id="errorCode" title="SEC_ERROR_UNKNOWN_ISSUER">SEC_ERROR_UNKNOWN_ISSUER</a>
This could be a problem with the server's configuration, or it could be someone trying to impersonate the server. If you have connected to this server successfully in the past, the error may be temporary, and you can try again later.
Or you can add an exception…
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What are the full and precise steps that lead you to gettin gthis error?
start thunderbird, update thunderbird, unpdate firefox, mozilla products are not ale to get to mozilla.org
only used mozilla products since they started, now firefox is useless as cand connect to numerous web pages
Located similar issue:
- https://support.mozilla.org/en-US/questions/1006527
- https://support.mozilla.org/en-US/questions/993843
Suggest you reboot computer in 'Safe mode with networking' then run scans to see if there is any malware.