Session Resumption Not Working on Windows Server 2022 with IIS 10

Michał Dedyk 5 Reputation points

Hello everyone,

I hope someone can help me with an issue I am facing after upgrading my server. I was previously using Windows Server 2012 R2 with IIS 8.5, and my .NET server's session resumption worked perfectly. When I tested my site on ssllabs, it showed "Session resumption (caching)" as "Yes." Everything seemed to be working as expected.

However, I recently decided to upgrade to Windows Server 2022 and started using IIS 10. Now, when I test my site on ssllabs, I get "Session resumption (caching): No (IDs assigned but not accepted)." It seems that session resumption is not working anymore after the upgrade. Just for your information, I am supporting only TLS 1.2 and TLS 1.3 on my new server.

I would really appreciate any guidance on how to enable session resumption on Windows Server 2022 with IIS 10. If anyone has encountered a similar problem or knows the steps to resolve this issue, please share your insights.Screenshot 2023-05-02 at 10.08.03

Internet Information Services
Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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