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the safetycertificate of mozilla org is invalid

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two out of ten times i try to email or go on the internet the connection fails, the smtp server can not be found and/or the mozilla org certificate is not recognized as valid, this is going on since on hollidays, before that everything worked perfect

two out of ten times i try to email or go on the internet the connection fails, the smtp server can not be found and/or the mozilla org certificate is not recognized as valid, this is going on since on hollidays, before that everything worked perfect

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You'd need to be a little more specific. What exact error message(s) do you get?

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