LDAP Test error unable to authenticate user

I've being trying to resove this issue since last week.
One computer when it logs under one particular user generates error event ID
529 through the day and night if stays logged.
Using Netdiag two test failed DC & LDAP Test. I'm guessing something in the
background is running and trying to access the Network but I just can't
figure out what is it. If anybody has any imput I'll apreciate it. Here is
the debug log on the 2 failed test (thanks):

DC list test . . . . . . . . . . . : Failed
You don't have access to DsBind to crestwoodsbs (192.168.16.2).
[ERROR_ACCESS_DENIED]
List of DCs in Domain 'CRESTWOODINC':
crestwoodsbs.CrestwoodInc.local


Trust relationship test. . . . . . : Passed
Test to ensure DomainSid of domain 'CRESTWOODINC' is correct.
[WARNING] Don't have access to test your domain sid for domain
'CRESTWOODINC'.
[Test skipped]
Secure channel for domain 'CRESTWOODINC' is to
'\\crestwoodsbs.CrestwoodInc.local'.
Secure channel for domain 'CRESTWOODINC' was successfully set to DC
'\\crestwoodsbs.CrestwoodInc.local'.


Kerberos test. . . . . . . . . . . : Passed
Cached Tickets:
Server: krbtgt/CRESTWOODINC.LOCAL
End Time: 7/6/2007 23:13:26
Renew Time: 7/13/2007 13:13:26
Server: cifs/OFFICEMGR
End Time: 7/6/2007 23:13:26
Renew Time: 7/13/2007 13:13:26
Server: cifs/LISAPC.CrestwoodInc.local
End Time: 7/6/2007 23:13:26
Renew Time: 7/13/2007 13:13:26
Server: cifs/CONTROLLER.CrestwoodInc.local
End Time: 7/6/2007 23:13:26
Renew Time: 7/13/2007 13:13:26
Server: host/aaron.crestwoodinc.local
End Time: 7/6/2007 23:13:26
Renew Time: 7/13/2007 13:13:26


LDAP test. . . . . . . . . . . . . : Failed

Do un-authenticated LDAP call to 'crestwoodsbs.CrestwoodInc.local'.
Found 1 entries:
Attr: currentTime
Val: 17 20070706215710.0Z
Attr: subschemaSubentry
Val: 64
CN=Aggregate,CN=Schema,CN=Configuration,DC=CrestwoodInc,DC=local
Attr: dsServiceName
Val: 121 CN=NTDS
Settings,CN=CRESTWOODSBS,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=CrestwoodInc,DC=local
Attr: namingContexts
Val: 24 DC=CrestwoodInc,DC=local
Val: 41 CN=Configuration,DC=CrestwoodInc,DC=local
Val: 51 CN=Schema,CN=Configuration,DC=CrestwoodInc,DC=local
Val: 42 DC=DomainDnsZones,DC=CrestwoodInc,DC=local
Val: 42 DC=ForestDnsZones,DC=CrestwoodInc,DC=local
Attr: defaultNamingContext
Val: 24 DC=CrestwoodInc,DC=local
Attr: schemaNamingContext
Val: 51 CN=Schema,CN=Configuration,DC=CrestwoodInc,DC=local
Attr: configurationNamingContext
Val: 41 CN=Configuration,DC=CrestwoodInc,DC=local
Attr: rootDomainNamingContext
Val: 24 DC=CrestwoodInc,DC=local
Attr: supportedControl
Val: 22 1.2.840.113556.1.4.319
Val: 22 1.2.840.113556.1.4.801
Val: 22 1.2.840.113556.1.4.473
Val: 22 1.2.840.113556.1.4.528
Val: 22 1.2.840.113556.1.4.417
Val: 22 1.2.840.113556.1.4.619
Val: 22 1.2.840.113556.1.4.841
Val: 22 1.2.840.113556.1.4.529
Val: 22 1.2.840.113556.1.4.805
Val: 22 1.2.840.113556.1.4.521
Val: 22 1.2.840.113556.1.4.970
Val: 23 1.2.840.113556.1.4.1338
Val: 22 1.2.840.113556.1.4.474
Val: 23 1.2.840.113556.1.4.1339
Val: 23 1.2.840.113556.1.4.1340
Val: 23 1.2.840.113556.1.4.1413
Val: 23 2.16.840.1.113730.3.4.9
Val: 24 2.16.840.1.113730.3.4.10
Val: 23 1.2.840.113556.1.4.1504
Val: 23 1.2.840.113556.1.4.1852
Val: 22 1.2.840.113556.1.4.802
Val: 23 1.2.840.113556.1.4.1907
Attr: supportedLDAPVersion
Val: 1 3
Val: 1 2
Attr: supportedLDAPPolicies
Val: 14 MaxPoolThreads
Val: 15 MaxDatagramRecv
Val: 16 MaxReceiveBuffer
Val: 15 InitRecvTimeout
Val: 14 MaxConnections
Val: 15 MaxConnIdleTime
Val: 11 MaxPageSize
Val: 16 MaxQueryDuration
Val: 16 MaxTempTableSize
Val: 16 MaxResultSetSize
Val: 22 MaxNotificationPerConn
Val: 11 MaxValRange
Attr: highestCommittedUSN
Val: 6 352379
Attr: supportedSASLMechanisms
Val: 6 GSSAPI
Val: 10 GSS-SPNEGO
Val: 8 EXTERNAL
Val: 10 DIGEST-MD5
Attr: dnsHostName
Val: 31 crestwoodsbs.CrestwoodInc.local
Attr: ldapServiceName
Val: 51 CrestwoodInc.local:crestwoodsbs$@CRESTWOODINC.LOCAL
Attr: serverName
Val: 104
CN=CRESTWOODSBS,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=CrestwoodInc,DC=local
Attr: supportedCapabilities
Val: 22 1.2.840.113556.1.4.800
Val: 23 1.2.840.113556.1.4.1670
Val: 23 1.2.840.113556.1.4.1791
Attr: isSynchronized
Val: 4 TRUE
Attr: isGlobalCatalogReady
Val: 4 TRUE
Attr: domainFunctionality
Val: 1 0
Attr: forestFunctionality
Val: 1 0
Attr: domainControllerFunctionality
Val: 1 2

Do NTLM authenticated LDAP call to 'crestwoodsbs.CrestwoodInc.local'.
[FATAL] Cannot do NTLM authenticated ldap_bind to
'crestwoodsbs.CrestwoodInc.local': Invalid Credentials.

Do Negotiate authenticated LDAP call to 'crestwoodsbs.CrestwoodInc.local'.
[FATAL] Cannot do Negotiate authenticated ldap_bind to
'crestwoodsbs.CrestwoodInc.local': Invalid Credentials.
[WARNING] Failed to query SPN registration on DC
'crestwoodsbs.CrestwoodInc.local'.
[FATAL] No LDAP servers work in the domain 'CRESTWOODINC'.

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