I have IIS Shared client configuration with certificate rules defined in IISClientCertificateMappingAuthentication/manytoOneMappings at website web.config level.
Suddenly I found I was getting HTTP 401.1 error when trying to access the web-service. Looking at the certificate rules in IIS, I found the password field is empty for all rules.
I removed the IIS Shared Configuration. Now when I try to add a certificate rule I get error "the value does not fall within the expected range".
I have tried reinstalling IIS feature from Windows Server 2012 but it hasn't helped.
Any help is highly appreciated!