This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

thunderbird does not connect to mozilla, nor can firefox gets the same message, and cannot add exception

  • 3 amsoshi
  • 1 yana da wannan matsala
  • 17 views
  • Amsa ta ƙarshe daga Toad-Hall

nicholas2
nicholas2
more options

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…

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…

All Replies (3)

Wayne Mery
Wayne Mery
  • Moderator
  • Top 10 Contributor
more options

What are the full and precise steps that lead you to gettin gthis error?

nicholas2
nicholas2 Mai mallakar tambaya
more options

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

Toad-Hall
Toad-Hall
  • Top 10 Contributor
more options

Located similar issue:

Suggest you reboot computer in 'Safe mode with networking' then run scans to see if there is any malware.