Logon 529 Errors

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I am receiving daily errors in my security logs for logon 529 errors. Our
local tech said they are happening on our network and that they are not
someone trying to hack into our system. I would like other opinions. The
errors I am receiving are:

Logon Failure:
Reason: Unknown user name or bad password
User Name: inna
Domain:
Logon Type: 3
Logon Process: Advapi
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Workstation Name: DELLSERVER
Caller User Name: DELLSERVER$
Caller Domain: DELLNET
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 2064
Transited Services: -
Source Network Address: -
Source Port: -

Logon Failure:
Reason: Unknown user name or bad password
User Name:
Domain: DELLSERVER
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: DELLSERVER
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 192.168.1.3
Source Port: 57596


Logon Failure:
Reason: Unknown user name or bad password
User Name:
Domain: DELLSERVER
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: DELLSERVER
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 192.168.1.3
Source Port: 54894


Thanks,
Terry


.



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