SockAuth, Kerberos, AcceptSecurityContext() fails with SEC_E_NO_CREDENTIALS after a while

Hello,

I am testing SockAuth for Kerberos authentication on Windows XP SP2
with Platform SDK April 2005.

    server.exe -pKerberos
    client.exe  -szushi -tnao -pKerberos

This works fine for several hours after I log in to my PC.

    Package Name: Kerberos
    Authentication Succeeded!
    Connected to server as user: ANONYMOUS LOGON

However, after I leave the PC up and screen locked for a while, say,
overnight, when I come back, unlock the screen and run the test, the
same test would fail.  In server.exe, AcceptSecurityContext() fails
with SEC_E_NO_CREDENTIALS.

I suspected one of the tickets had expired.  However, kerbtray.exe
shows that all the tickets, including krbtgt of my account (nao), had
been renewed successfully.

So I am at a loss.  Could anyone shine a light on a solution to this?
Has something expired during the night?  If it did, how can I renew it?
 

Thank you,

.

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