Forum Discussion
Exchange 2013 The certificate key algorithm is not supported
Hello, We have an Exchange 2013 server, updated to CU23, which worked fine until one day, it showed the error on OWA "The certificate key algorithm is not supported"! I tried to put back an older...
I already configured the proper ciphers with IISCrypto before it started doing this issue. I then tried many, many, many different settings in case one would work, but the error stays the same. I did not notice when this issue started because I am not using OWA/ECP often, but I can assure that when I installed the latest SSL certificate, it was working properly.
Russell,
Please check and install .NET Framework 4.8 and all windows update.
After the update, please check TLS .Net.
Transport Layer Security (TLS) best practices with the .NET Framework https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls
Update and configure the .NET Framework to support TLS 1.2
https://docs.microsoft.com/en-us/mem/configmgr/core/plan-design/security/enable-tls-1-2-client#bkmk_net