This may or not be the problem but it's worth looking.
Go to Start then Run, type Regedit and OK
Go down the hierarchy HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Lsa
entry restrictanonymous should have value 0 (zero) - if it has value 1 (one) that's probably your issue.
caveat...you will open that workstation's permissions by changing this value.
zeroth
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