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secure connection failed message only with Firefox and only with some pcs.

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Other browsers (Msoft Edge) work fine. All suggested fixes don't do anything. Some of my pcs work OK with Firefox, others (this one) don't. Obviously Firefox's problem, not the site I'm trying to reach (and have been able to in the past for a long time with this pc).

Other browsers (Msoft Edge) work fine. All suggested fixes don't do anything. Some of my pcs work OK with Firefox, others (this one) don't. Obviously Firefox's problem, not the site I'm trying to reach (and have been able to in the past for a long time with this pc).

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The "Secure Connection Failed" page typically has scanty information about the problem and if the padlock appears normally, can be taken to mean "connection failed." Does anything in this article help: Secure connection failed and Firefox did not connect?