We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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

This thread was archived. Please ask a new question if you need help.

Error Message on startup

  • 3 replies
  • 1 has this problem
  • 1 view
  • Last reply by Matt

jaylinnh
jaylinnh
more options

When I open Thunderbird to access my Gmail I get the message: "Secure connection failed. Start.thunderbird.net 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</as" Would appreciate help to resolve this. </p>

When I open Thunderbird to access my Gmail I get the message: "Secure connection failed. Start.thunderbird.net 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</as" Would appreciate help to resolve this.

All Replies (3)

Matt
Matt
  • Moderator
  • Top 10 Contributor
more options

What anti virus is messing with SSL certificates now?

jaylinnh
jaylinnh Question owner
more options

Using Kaspersky Total Security

Matt
Matt
  • Moderator
  • Top 10 Contributor
more options

See http://support.kaspersky.com/6851

Why these folk think they can sign their own certificates defies logic for a firm that says they are about security. I do not trust them and I do not use their products because they break the chain of trust on which SSL /TLS is built.

The law enforcement folk no longer need to break encryption, just subpoena the information from kaspersky and a couple of others as they have access to the unencrypted data in their application and can easily upload it to any site they wish.