How do you find out if Active Directory is using Kerberos or NTLM?

Question

Is there a command line program you can use?

Answer 1

I think question should be twisted on its head. Active Directory supports both Kerberos and NTLM. Windows will first try Kerberos and if all requirements are not met it will fallback to NTLM.

I will give you example, accessing file share by name like \server1\share would invoke Kerberos and should succeed given proper permision. But accessing same file share using IP address would invoke Kerberos first and fail (as there is no SPN for IP Address) and then fail over to NTLM.

So determine how your program is trying to authenticate against AD and should tell you which protocol is being used.

I would be curious to know, what prompted to ask you this question.

Answer 2

You should really be auditing logon events, whether the computer is a server or workstation. It's helpful to figure out which users are accessing your system, and to troubleshoot security related issues.

You can modify your Audit Policy with Group Policy: Start...Run...gpedit.msc...Computer Configuration, Windows Settings, Security Settings, Local Policies, Audit Policy, "Audit logon events". Check the "Success" and "Failure" check boxes. Try logging out and logging in to see some typical 540 events in your Windows Security Event Log.

Answer 3

You can try running klist.exe to see if there are any current Kerberos tickets on the client.
There's also a way to log Kerberos events if you hack the registry.

Answer 4

I have written a j2me-kerberos apps on windows 2000 server. Now how do a test that my kerberos side is up and running. I know with appache i'll type the http://localhost and it will show my proof. But I'm debugging my apps and I can't tell if the problem is the kerberos since i'm getting error like socket connection not found thank you

Answer 5

Netstat shows all listening TCP and UDP connections. using the option -na is for all connections and no resolution of names or ports. 'b' option is to show the program assiciated with it. If DNS is running it may show alot of other connections so you might want to also specify TCP.

Kerberos is most definately running if its a deploy Active Directory Domain Controller.

netstat -nab

Answer 6

Assuming you're auditing logon events, check your security event log and look for 540 events. They will tell you whether a specific authentication was done with Kerberos or NTLM.

Answer 7

Depends on the client/server that is involved. For example, there is a web page (sorry, don't have time to search for it now) you can put on a web site that will tell you if kerberos or NTLM was used. However I know of no way to tell what authentication method SQL server has used. Although as has been sugegsted before, the security log may tell you.
Why are you trying to find out?