> What is the method that validates if the ticket is valid?

Which ticket do you mean, Service Ticket (ST) or Ticket-Granting Ticket (TGT)?

> This functionality is not done by a user but an application that will need
> to know if a user is currently active. The application will know the login
> and the ticket.

When you say "login," do you mean the both the username and password
for an arbitrary user?  How will the application know the ticket?
It's important to clarify which ticket you mean, but I believe you
mean service ticket.  Service tickets are one-time-use credentials, so
revalidating an expired ST is not possible.

M

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