We have SBS2011 with exchange server, one user is using Macbook pro, he is only setup using outlook anywhere, he seems to be getting his email fine. but we are getting a event 4625 in security log every minute or two.
An account failed to log on.
Security ID: NULL SID
Account Name: -
Account Domain: -
Logon ID: 0x0
Logon Type: 3
Account For Which Logon Failed:
Security ID: NULL SID
Account Name: Mark
Failure Reason: Unknown user name or bad password.
Sub Status: 0xc000006a
Caller Process ID: 0x0
Caller Process Name: -
Workstation Name: Mark-MacBook-Pro-2.local
Source Network Address: 192.168.0.254
Source Port: 12900
Detailed Authentication Information:
Logon Process: NtLmSsp
Authentication Package: NTLM
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
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 was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information 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.
- 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.
any help would be appreciated!
Thanks for posting your issue in the forum.
Based on your description, since lots of event 4625 with logon type 3 error were logged in the event log, I suggest we could try to refer to the following similar threads for troubleshooting.
Numerous Event ID 4625s in Security Logs
numerous 4625 errors in the event log
Hope this helps.
TechNet Community Support
- Marked as answer by Andy QiMicrosoft contingent staff, Moderator Saturday, July 27, 2013 2:58 AM