Constant logon and logoff event in AD server 2008 32 bit

hi,

 User account logs off just after logon for all AD users and getting security events has below mentioned:  

Note :- Only security events are generating for issue, but in real in time the user are not logged off.


################################################################

An account was successfully logged on.

Subject:
      Security ID:            NULL SID
      Account Name:            -
      Account Domain:            -
      Logon ID:            0x0

Logon Type:                  3

New Logon:
      Security ID:            NRPLAD\nalini
      Account Name:            nalini
      Account Domain:            NRPLAD
      Logon ID:            0x2c007db
      Logon GUID:            {8163697b-fdc4-af03-c513-905c5467a468}

Process Information:
      Process ID:            0x0
      Process Name:            -

Network Information:
      Workstation Name:      
      Source Network Address:      192.168.0.68
      Source Port:            3797

Detailed Authentication Information:
      Logon Process:            Kerberos
      Authentication Package:      Kerberos
      Transited Services:      -
      Package Name (NTLM only):      -
      Key Length:            0

This event is generated when a logon session is created. It is generated on the computer that was accessed.

The subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.

The logon type field indicates the kind of logon that occurred. The most common types are 2 (interactive) and 3 (network).

The New Logon fields indicate the account for whom the new logon was created, i.e. the account that was logged on.

The network fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.

The authentication information fields provide detailed information about this specific logon request.
      - Logon GUID is a unique identifier that can be used to correlate this event with a KDC event.
      - Transited services indicate which intermediate services have participated in this logon request.
      - Package name indicates which sub-protocol was used among the NTLM protocols.
      - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.



################################################################


An account was logged off.

Subject:
      Security ID:            NRPLAD\nalini
      Account Name:            nalini
      Account Domain:            NRPLAD
      Logon ID:            0x2c007cb

Logon Type:                  3

This event is generated when a logon session is destroyed. It may be positively correlated with a logon event using the Logon ID value. Logon IDs are only unique between reboots on the same computer.


############################################################