Hi @Pie ,
This is a certificate issue. When the ARR reverse proxy HTTPS request, ARR server also need to install server certificate. Did you install server certificate on ARR server? If not, please import backend server into ARR server.
Another setting is let ARR server to ignore ssl authentication, you can set in registry to ignore Common name mismatches in the SSL communication.
Navigate to HKEY_LOCAL_MACHINE\ SOFTWARE\Microsoft\IIS Extensions\Application Request Routing\Parameters
and set SecureConnectionIgnoreFlags
to 0.
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Best regards,
Bruce Zhang