Hi UsmanAli,
Due to the high priority of this: Run event viewer querys before you work on the report
If your contractor are running windows machine (95% of people use this) and authenticate againts your Active Directory, they are some of windows events that could help you to detect his IP addresses any time.
Windows 528 for succesful Logon (Local) or Windows 540 for network succesful Logon for windows XP
or Windows 4624 in Windows Vista, 7 or 8.
Example of Windows 4624 message:
%NICWIN-4-Security_4624_Microsoft-Windows-Security-Auditing: Security,rn=580163688 cid=0x00003100 eid=0x00001210,Mon Dec 17 14:25:47 2012,4624,Microsoft-Windows-Security-Auditing,None,Success Audit,name_of_the_AD_machine,Logon,,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: LOGON_NAME$ Account Name: NAME_OF_THE_MACHINE$ Account Domain: MERCANTIL Logon ID: 0x1e9d6afdc Logon GUID: {CDAA5A82-12D1-2115-FC5D-B8852362982A} Process Information: Process ID: 0x0 Process Name: - Network Information: Workstation Name: Source Network Address: 10.0.24.46 Source Port: 1067 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 whic
In the case of Windows 4624 you have the IP address directly, but for Windows 528 or 540 you can use the Logon ID field to trace all the session activity for that user and get his IP address.
Hope this Help.
