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I installed Let's Encrypt for my website but I always get error when browse the site via Windows XP

Your connection is not secure

The owner of has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

How to fix this issues so the site can display with Windows XP normaly



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Let's Encrypt Windows XP support is limited.   Here's what the Let's Encrypt team said about it:

Windows XP:
- Pre-SP3 will never work, because it lacks SHA2 support.
- SP3: Chrome and IE don't currently work because of the name constraints on our intermediate282. We're going to take a look at whether that's possible to work around in the long run, but for now it doesn't work.
- Firefox works because it has its own validation code.


Then of course under windows XP if you're not on a dedicated IP you also have to worry about the fact Internet Explorer wouldn't support SNI.

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  • 2 weeks later...

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