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2 devices both using same Firefox update 1 can access websites and the other can't with correct time setting

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I repeatedly receive" Your connection is not secure" with the Advanced detail" SEC_ERROR_UNKNOWN_ISSUER" on my desktop Firefox but my laptop still can access the problem sites on Firefox. Both are using WIN 10 and can access the websites using Google Chrome or IE11. Any suggestions? Many Thanks Stephen

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both devices are using Bitdefender.

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Make sure they are the same version and up to date.

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Both versions are up to date and the same.