Use TLS 1.0 needed in Internet Explorer

I have set up my web site (www.meierpollard.co.uk) with an InstantSSL
security certificate referenced in httpd.conf. When using Netscape
Navigator it can be viewed through a secure connection without complaint
and the certificate chain can be viewed.

When using IE (6) however the certificate authority can not be verified and
when I view the details I can see the chain has not been resolved. However,
by selecting Use TLS 1.0 in the Advanced preferences I can get it to work.

Why would my web site be demanding use of TLS when by default IE doesn't
use it?

Thanks,
John

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