[Samba] SAM LOGON & SAM Response - user unknown

Samba: 3.0.28a

I'm staring at Wireshark output to try to see why one user can read a
particular cookie file from one machine, but the same user cannot read
it from a different machine.

I see:

SMB_NETLOGON SAM LOGON request from client
SMB_NETLOGON SAM Response - user unknown

The detail of the exchange is below.

The user name provided appears to be blank. So this may not be a
surprise.

Is this significant, or is it a vestigial exchange ?

Chris
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