Sitecore Error: Unhandled exception: "Keyset does not exist" A few days back, I changed the certificate on the Content Management server, after that, I was not able to login into the Content Management Server. It was throwing the below error: Solution: After some investigation I found that my new certificate which I was using for the Identity server, does not have the permission of the Identity App Pool so I followed the below steps: Enter "mmc" in the run command window. Click on Add/Remove Snap-ins option inside the File menu. Select Certificates and click on Add button, then select Computer account and click on Next->Finish->Ok Go to the Personal-> Certificates. Now right-click on the Identity server certificate, then click All Tasks-> Manage Private Keys. Click on Add button and add IIS App Pool\Identity.XXX permission. Click on Check Name, and give read access. I hope it will work for you. Happy coding :)