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Why? 'Secure connection failed live.mozillamessaging.com uses an invalid security certificate On windows 7

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Martin100
Martin100
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Secure connection failed

live.mozillamessaging.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer) 

   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… (THIS LINK DOES NOT WORK)

Secure connection failed live.mozillamessaging.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer) 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… (THIS LINK DOES NOT WORK)

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christ1
christ1
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What is your Thunderbird version?