WCF Error “This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case”

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We had this issue as the host server had been updated to use TLS V1.2 and we were connecting using standard SSL. This was an update made as part of pen testing of the sites. We saw the issue in code connection, but not browsers going to the wsdl.
Below code resolved:

if (System.Net.ServicePointManager.SecurityProtocol == (SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls))
    System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13;

Taken from here: Disable SSL fallback and use only TLS for outbound connections in .NET? (Poodle mitigation)

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