Lots of 529 failed logon attempts

[sevaanan]

I checked a number of failed logon attempts in Security Log. It keep on increasing. There are around 529 listed till now. It looks that some user keeps on using wrong password. I had checked and ample of them remember their passwords. Does there is any other or different kind of service which is running and causing this error. I need some help to fid why this error is appears. I had posted the log below please check:

Logon Failure:
Reason: Unknown user name or bad password
User Name: Martin
Domain: DOMAIN
Logon Type: 7
Logon Process: User32
Authentication Package: Negotiate
Workstation Name: TS
Caller User Name: TS$
Caller Domain: DOMAIN
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 5532
Transited Services: -
Source Network Address: 192.168.26.102
Source Port: 1565


Logon Failure:
Reason: Unknown user name or bad password
User Name: Davidm
Domain: DOMAIN
Logon Type: 10
Logon Process: User32
Authentication Package: Negotiate
Workstation Name: TS
Caller User Name: TS$
Caller Domain: DOMAIN
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 6132
Transited Services: -
Source Network Address: 192.168.26.103
Source Port: 1047


Logon Failure:
Reason: Unknown user name or bad password
User Name: clayt
Domain: DOMAIN
Logon Type: 7
Logon Process: User32
Authentication Package: Negotiate
Workstation Name: TS
Caller User Name: TS$
Caller Domain: DOMAIN
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 2412
Transited Services: -
Source Network Address: 192.168.36.11
Source Port: 1042

[Judy B]

Check that your system does not has settings for screensaver lock. You must verify that once and see whether it is applied or not. If yes then simply disable that. There are some users who are trying to access the system with wrong password. I am not sure that there is any other application which can be the cause of this kind of errors.