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Firfox switching HTTP only site to HTTPS and failing

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I have a 1848ETC-HST data logger from Real Time Automation on an isolated network that does not support HTTPS but Firefox keeps changing it to HTTPS. I tried a private window with the same results. HTTPS-Only Mode is disabled. I entered an exception even though it should not need it. It was working in Firefox at one time and it still works with safari and chrome.

I have a 1848ETC-HST data logger from Real Time Automation on an isolated network that does not support HTTPS but Firefox keeps changing it to HTTPS. I tried a private window with the same results. HTTPS-Only Mode is disabled. I entered an exception even though it should not need it. It was working in Firefox at one time and it still works with safari and chrome.
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That comes from the site not from Firefox.

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Could you test by using a full URL (for example, from your history) to see whether Firefox still opens it normally or tries to upgrade it to HTTPS?

If that works: The problem could be a new behavior in Firefox 133 for navigating to a site where you didn't specify the protocol yourself (like just example.com). Before Firefox 133, Firefox always started with http://, but now it always starts with https://.

If that doesn't work: We'll have to look at some other potential reasons.

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