Per https://support.servertastic.com/sha2-sha256-compatibility/ the IE6 under Windows XP is not able to connect to SSL certificates with SHA2 digest hashing. If I check a site with such an SSL certificate the Handshake Simulation tells us:
|IE 6 / XP No FS 1 No SNI 2||SSL 3||TLS_RSA_WITH_RC4_128_SHA (||128|
I think this is a bug and should be fixed. I have not really tested IE6 with XP to verify what is written in the compatibility page I found on the net, but I found several of these pages and all say IE7+ with XP SP3 is required.
Can someone verify if this is a bug in the SSL Server checker and fix this issue, please?