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How to disable ECDH key-reuse on IIS 10?

hn flag

A SSL Report from SSL Labs for a domain of mine indicates that ECDH key-reuse (ECDH public server param reuse) is happening on the IIS 10 (Windows Server 2016) with TLS 1.2. I have verified it with TestSSLServer and testssl.sh.

I am not able to find a solution on the big Internet to disable the ECDH key-reuse on IIS 10. It does not seem to work with MaximumCacheSize nor ServerCacheTime.

Can anyone of you help with a solution to disable the ECDH key-reuse? (The web server do not reuse DH keys, even though some cipher suites with DHE have been activated.)

Thank you!

Crypto Johnny avatar
hn flag
This is apparently a million dollar question no one I have asked so far have an answer for.. If you can answer this one, I owe you one hour of work.
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