Scenario:
You have 2 forests
Resource.com – workstation forest
contoso.com – user forest
EMEA.contoso.com is a child domain in the user forest and contains user accounts.
There exists a Domain Local group in Resource.com – RESOURCE\R_remAssistAdmins
There exists a Global group in EMEA.contoso.com – EMEA\E_remAssistAdmins
EMEA\E_remAssistAdmins is a memberof RESOURCE\R_remAssistAdmins
The following configuration has been done:
1. In Resource.com you have configure Remote assistance so that the local “Offer Remote Assistance Helpers” group contains RESOURCE\R_remAssistAdmins.
2. Also the user rights policy to “access this computer from the network” for the Workstations in Resource.com has been modified from the default and Everyone group has been removed. Instead RESOURCE\R_remAssistAdmins has been added.
Example users EMEA\expert and EMEA\novice log onto workstations Resource\W1 and Resource\W2 respectively.
EMEA\Expert user wants to use Remote assistance to help the EMEA\novice user.
Expert runs msra /offerra from his workstation and receives the following error:
On the Novice workstation (W2) the following event is logged in the security log:
Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: xx/xx/xxxx xx:xx:xx
Event ID: 4625
Task Category: Logon
Level: Information
Keywords: Audit Failure
User: N/A
Computer: W2.RESOURCE.com
Description:
An account failed to log on
Subject:
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:
Account Domain:
Failure Information:
Failure Reason: An Error occured during Logon.
Status: 0xc000006d
Sub Status: 0xc000015b
Process Information:
Caller Process ID: 0x0
Caller Process Name: -
Network Information:
Workstation Name: -
Source Network Address: xxx.xx.xx.xx
Source Port: xxxxx
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 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.
A network trace of the connection shows the response from Novice workstatuion with RPC Fault Ox5 (Access Denied) .
MSRPC MSRPC:c/o Fault: Call=0x2 Context=0x0 Status=0x5 Cancels=0x0 {MSRPC:89, TCP:87, IPv6:67}
You have 2 forests
Resource.com – workstation forest
contoso.com – user forest
EMEA.contoso.com is a child domain in the user forest and contains user accounts.
There exists a Domain Local group in Resource.com – RESOURCE\R_remAssistAdmins
There exists a Global group in EMEA.contoso.com – EMEA\E_remAssistAdmins
EMEA\E_remAssistAdmins is a memberof RESOURCE\R_remAssistAdmins
The following configuration has been done:
1. In Resource.com you have configure Remote assistance so that the local “Offer Remote Assistance Helpers” group contains RESOURCE\R_remAssistAdmins.
2. Also the user rights policy to “access this computer from the network” for the Workstations in Resource.com has been modified from the default and Everyone group has been removed. Instead RESOURCE\R_remAssistAdmins has been added.
Example users EMEA\expert and EMEA\novice log onto workstations Resource\W1 and Resource\W2 respectively.
EMEA\Expert user wants to use Remote assistance to help the EMEA\novice user.
Expert runs msra /offerra from his workstation and receives the following error:
On the Novice workstation (W2) the following event is logged in the security log:
Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: xx/xx/xxxx xx:xx:xx
Event ID: 4625
Task Category: Logon
Level: Information
Keywords: Audit Failure
User: N/A
Computer: W2.RESOURCE.com
Description:
An account failed to log on
Subject:
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:
Account Domain:
Failure Information:
Failure Reason: An Error occured during Logon.
Status: 0xc000006d
Sub Status: 0xc000015b
Process Information:
Caller Process ID: 0x0
Caller Process Name: -
Network Information:
Workstation Name: -
Source Network Address: xxx.xx.xx.xx
Source Port: xxxxx
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 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.
A network trace of the connection shows the response from Novice workstatuion with RPC Fault Ox5 (Access Denied) .
MSRPC MSRPC:c/o Fault: Call=0x2 Context=0x0 Status=0x5 Cancels=0x0 {MSRPC:89, TCP:87, IPv6:67}