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How can IIS logs help identify weak TLS usage?
IIS logs can already be used to correlate client IP address, user agent string, and service URI. With the addition of the new custom logging fields detailed below, you will be able to quantify the usage of outdated security protocols and ciphers by clients connecting to your services.
How are SSL info fields logged in IIS?
Each SSL info field is a hexadecimal number that maps to either a secure protocol version or cipher suite algorithm. For an HTTP plain-text request, all four fields will be logged as ‘-‘. A sample log and explanation of the new fields follows: For more information visit Official Microsoft Documentation for Custom Logging Fields in IIS.
How to assign private key to a new certificate after you?
SerialNumber is the serial number that you wrote down in step 17. In the Certificates snap-in, right-click Certificates, and then select Refresh. The certificate now has an associated private key. You can now use the IIS MMC to assign the recovered keyset (certificate) to the web site that you want.
What does it mean when SSL settings are deleted?
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. This issue may occur when there is a legacy SSL certificate hash property in the applicationHost.config file ( Reference 1, Reference 2 ).
Why do custom client applications need TLS support?
Custom client applications may consume a web service running on the server. Those applications may be based for example on an old version of the .NET framework. So such applications may need to be rebuilt against a more recent version of the .NET framework by the developer to be able to use a recent version of TLS.
What do you need to know about TLS 1.0?
This document presents the latest guidance on rapidly identifying and removing Transport Layer Security (TLS) protocol version 1.0 dependencies in software built on top of Microsoft operating systems, following up with details on product changes and new features delivered by Microsoft to protect your own customers and online services.
How to determine what version of TLS my client is requesting?
A quick way to determine what TLS version will be requested by various clients when connecting to your online services is by referring to the Handshake Simulation at Qualys SSL Labs . This simulation covers client OS/browser combinations across manufacturers.