My domain is:
and it work fine on my pc running windows 10
but not on other computers like my client ones running windows 7 sp1
it show the NET::ERR_CERT_AUTHORITY_INVALID warning and mark the website insecure
also i have checked that there is no antivirus or firewall installed or working
any idea on how to fix this please ?
There's nothing wrong with your site: it serves the alternative certificate chain which chains up to the ISRG Root X1 root certificate. Which should work on most clients which have updated their trust store in the last 5 years.
Your clients running an unsupported version of Windows should at least enable updates which should make sure their Windows 7 has the ISRG Root X1 root certificate in their trust store.
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