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Kerberos ticket renewal after expiration

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I have virtual machine in domain. In friday's evening my colleague loged in with his credential to this machine. In several hours I ave this virtual machine. Then in monday's morning i resumed this VM and my colleague's session was still valid. So I could get any access i wanted. I checked Kerberos tickets with KLIST command, and disover that all tickets has been renewed when I resumed my VM. How it is possible, if tickets validity time is 10 hours?

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