The issue seems to be that the workstation user accounts change their passwords every 30 days. Take a look at one of my workstations log files:
[2010/06/24 09:43:25, 1] auth/auth_util.c:577(make_server_info_sam)
User WORKSTATION29$ in passdb, but getpwnam() fails!
[2010/06/24 09:43:25, 0] auth/auth_sam.c:355(check_sam_security)
check_sam_security: make_server_info_sam() failed with 'NT_STATUS_NO_SUCH_USER'
The issue seems to be that the workstation user accounts change their passwords every 30 days. Take a look at one of my workstations log files:
[2010/06/24 09:43:25, 1] auth/auth_ util.c: 577(make_ server_ info_sam) sam.c:355( check_sam_ security) sam_security: make_server_ info_sam( ) failed with 'NT_STATUS_ NO_SUCH_ USER'
User WORKSTATION29$ in passdb, but getpwnam() fails!
[2010/06/24 09:43:25, 0] auth/auth_
check_