How to allow domain users to login again?

The error message is seen when SSPI utilizes Kerberos authentication to delegate over TCP and Kerberos authentication is unable to finish the required tasks to delegate the user security token to the destination system that is executing SQL server. When you run the SQL server service under the localsystem account, the SPN is registered and Kerberos authentication communicates well with the desktop that is executing SQL server. If you execute the SQL server service under the domain account, the trial to generate the SPN will fail since the domain account does not have the authority to create their personal SPNs. The mid server must be authenticated for delegation in the current directory if you are deploying a local system account.

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