Roffen Posted February 3, 2019 Share Posted February 3, 2019 XP machine, message: "Your connection is not secure... This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result it is not possible to add an exception for this certificate." What, if anything, can I do? Link to comment Share on other sites More sharing options...
Mcinwwl Posted February 3, 2019 Share Posted February 3, 2019 1. Which version of Firefox do you use? 2. Which website do you refer to? 3. do you install POSReady 2009 updates or not? Link to comment Share on other sites More sharing options...
dencorso Posted February 4, 2019 Share Posted February 4, 2019 Looks like problems with antivirus software or a missing certificate. This report does not refer to XP but may be enlightening nonetheless: https://www.bleepingcomputer.com/news/software/mozilla-halts-firefox-65-rollout-due-to-insecure-certificate-errors/ Link to comment Share on other sites More sharing options...
RED-CHAMBER Posted February 6, 2019 Share Posted February 6, 2019 (edited) I was plagued with those messages until in my antivirus, in network configuration, specified not to analyze the encrypted connections. Edited February 6, 2019 by RED-CHAMBER Link to comment Share on other sites More sharing options...
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