证实用户的身份之后，向用户颁发服务票据。
Once the user's identification is verified, it issues the service ticket to the user.
客户机拥有有效的 TGT 但不能获取服务票据（TGS）
The client has the valid TGT but cannot obtain the service ticket(TGS)
哪个用户请求哪种类型的服务票据、请求的时间和用户的IP地址。
Which user requested for which type of service ticket, at what time and from what IP address?
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