The error message below is displayed in the Event Viewer when the IIS binding is deleted unexpectedly or the SSL certificate in the IIS binding is replaced or removed.
Event ID 15300
SSL Certificate Settings deleted for endpoint
This issue may occur when there is a legacy SSL certificate hash property in the applicationHost.config file (Reference 1, Reference 2). In order to solve it, search for an entry similar to the one below and remove it.
<key path="LM/W3SVC/X"> <property id="5506" dataType="Binary" userType="1" attributes="None" value="oXiHOzFAMOF0YxIuI7soWvDFEzg=" /></key>
If it doesn’t work, there are a few more things to check:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client
If it’s an Azure Cloud Service, you will need to have access to Visual Studio solution to implement a valid certificate.
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