How do I determine which certificate is causing the Schannel fatal error 46? We have an exchange 2013 CAS server that is getting spammed with Event ID 36887: Schannel errors every few minutes that only say "The following Fatal alert was received:
46." in the description. This comes up as an TLS1_ALERT_CERTIFICATE_UNKNOWN (46) issue but I've verified IIS correctly has SSL configured with the correct certificates and the client certificates on the server are showing as valid. There are no expired
certificates active.
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