Lenovo Software Help Center

How does AD Secure Mode work?

Problem: How does AD Secure Mode work?

Cause: N/A

Prerequisite(s):
  • LanSchool Student and Teacher
Solution(s): 

During the teacher-student handshake, the student will try to determine if the teacher is in the LanSchool Teachers group within the teacher's domain. To do that, the student must be able to contact a domain controller for the teacher's domain. The student must also be authorized to access that domain and query the groups for the teacher domain. 

LanSchool uses the Microsoft Win32 APIs to do this connection and query. The "big call" of the process is AcceptSecurityContext. This function is the one that we use to say "go ensure this user (the student) is authorized to talk to the teacher's domain and set up any connection/authentication necessary". 
Usually, we get back some form of "yes" or "no" 
with "no" meaning that they are not authorized. 

If the student is unable to initiate a transaction with the domain controller for the teacher's domain, then there are few things to check.

1) The domain name is wrong 
2) The requesting domain is not trusted by the target domain. 
3) The domain is unavailable, possible the domain controller is down or not able to be contacted. 

The following URL from Microsoft explains some of the security features: http://msdn.microsoft.com/en-us/library/windows/desktop/aa374703(v=vs.85).aspx Search for "SEC_E_NO_AUTHENTICATING_AUTHORITY" on this page to find more information on what LanSchool uses. 

If you have problems with a specific student machine not being able to validate the teacher then the following things should be tried. 

We suggest trying the following: 

1) Remove the student machine from the student domain. Reboot. Add the student machine back to the student domain. Reboot. 
2) Run the Microsoft domain metadata clean up tools: 
a. http://technet.microsoft.com/pt-pt/library/cc816907%28v=ws.10%29.aspx 
b. http://technet.microsoft.com/en-us/library/cc776854%28v=ws.10%29.aspx 
c. http://blogs.technet.com/b/askds/archive/2011/03/22/what-does-dcdiag-actually-do.aspx 
3) Validate the network routing and connection from the student machine to the teacher domain controller. 
a. Ping the teacher's PDC from the student. 
b. Ensure that AD specific packets are passing through any firewalls or packet filters. 

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