Symptoms

The K2 Host Server stopped refuses to start with the following error:

"SourceCode.Hosting.Server.Runtime.HostServerEngine.StartHostServer","2001 Error Starting Host Server: SQL User manager Error:The target principal name is incorrect. Cannot generate SSPI context"

The database server is up and running and the user account credentials haven't been changed.
 

Diagnoses

Issue:
K2 Host Server Not Starting.
"SourceCode.Hosting.Server.Runtime.HostServerEngine.StartHostServer","2001 Error Starting Host Server: SQL User manager Error:The target principal name is incorrect. Cannot generate SSPI context
 

Resolution

Resolution:
Based on previous tickets, it seemed as if the issue was specific to environments where Kerberos authentication is used.
Asked the customer to confirm if Kerberos is used, the customer confirmed this.
Customer chose to close the ticket, reason being: Domain Access was down, got the server administrator to reset the Domain Controller.