Maximum lifetime for service ticket

A brief look at configuring Maximum lifetime for service ticket policy setting

The Maximum lifetime for service ticket policy setting determines the time (expressed in minutes) that a session ticket granted by Key Distribution Center (KDC), can be used to access a service on the domain. The value should be 10 minutes and above and it must be less than or equal to the value of the Maximum lifetime for service ticket policy setting.

This policy setting values for this Group Policy setting are:

• can be defined by the user from 10 through 99,999, or 0 (in which case service tickets do not expire).
• can be left undefined.

If an expired session ticket is presented by a client when requesting a connection to a server, the server returns an error message. The client must acquire a new session ticket from the Kerberos V5 KDC. Session tickets are used only to authenticate new connections with servers. So once, authentication is done, the validity of the session ticket does not matter. If the session ticket that authenticated the connection expires during the connection, operations in progress do not get interrupted.

Security Concerns

If a high value is set for this policy, users might be able to access network resources outside of their logon hours. Additionally, disabled user accounts might still be able to access network services by using service tickets issued before the account was disabled. If the value is set to 0, service tickets never expire.

The Microsoft recommended value for this policy is 600 minutes.

Group Policy:

Client devices receive a fresh configuration when the next scheduled and successful Group Policy refresh occurs. To enforce these new settings, you'll need to run the command in a prompt ; gpupdate.exe /force. On the local device, the Security Configuration Engine will refresh this setting in about five minutes.

Settings are applied in the following order through a Group Policy Object (GPO), which will overwrite settings on the local computer at the next Group Policy update:

• Local policy settings
• Site policy settings
• Domain policy settings
• OU policy settings

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