Sophos XG - Lets Encrypt broken - Certificate authority: Invalid or not installed

After the latest DST X3 certificate issue. All of my Let's encrypt certificats is not being validated correctly on my Sophos XG. Everything updated to latest version.

I've tried to remove the Let's Encrypt R3 certificates. Re-upload the new ones. Followed all guides available. But still my issue persists.

All my iOS devices accessing WAF sites from the outside, still pukes saying the certificate is expired on 29th september. Even though I've reissued completely new certificates and removed everything i could finde delated to DST...

What on earth is going on?

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[edited by: emmosophos at 10:27 PM (GMT -7) on 12 Oct 2021]
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  • I have the same issue, al the necessary intermediate and root authorities are installed, still the imported pfx lets encrypt certificates are marked with the red cross and the message "Certificate authority: Invalid or not installed Issuer

    /C=US/O=Let's Encrypt/CN=R3.
    This mentioned certificate is installed under Certificate authorities.
    Also a waf protected website is reported by ssllabs supplying the old expired DST certificate, but
    that certificate is nowhere to be found (Certificate authorities) in the management interface of Sophos XG

    SFVH (SFOS 18.5.1 MR-1-Build326)

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