Pre-Authentication is a security measure to prevent a
client from calling to the KDC and getting a response back that it can work on
cracking to break the encryption. The client has to prove who it is before it
gets anything useful basically...
You can disable pre-auth for an account through the ADUC
GUI by looking at the Account Tab and looking specifically at account options
then Do not Require Kerberos preauthentication... It is a bit in
userAccountControl, specifically 0x400000. I would say disable it to test to see
if it then works, but I wouldn't leave it configured that way. It is just a
method to make sure everything else is ok.
Pre-Auth is not the default for any of the kerberos
implementations EXCEPT for the MS implementation from what I recall.
joe
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gasper, Rick Sent: Thursday, August 05, 2004 3:24 PM To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] Kerberos question The program uses apache, I am still working with the vendor on this. This is the error from the DC:
Event Type: Failure Audit Event Source: Security Event Category: Account Logon Event ID: 675 Date: 8/5/2004 Time: 3:15:59 PM User: NT AUTHORITY\SYSTEM Computer: KINGS-DC01 Description: Pre-authentication failed: User Name: ricktest User ID: KINGS\ricktest Service Name: krbtgt/KINGS.EDU Pre-Authentication Type: 0x0 Failure Code: 0x19 Client Address: 10.1.18.48
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Rick
Gasper
From:
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On Behalf Of Mulnick,
Al
There are tools to monitor kerberos conversations (capture), but I think you're likely better off using success/failure audit logging to see what's going on, what's being attempted and where authentication is failing.
I think the following is most likely to be helpful http://support.microsoft.com/default.aspx?kbid=326985
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Gasper,
Rick Question,: is there a utility that would use Kerberos to login (Kind of like a test login utility)?
We are not experiencing any problem with logins anywhere (except as mentioned).. This is the first non windows application we are deploying that uses Kerberos (outside of windows). IT does recognize a bad password as a bad password, but throws an error with the correct password is given:
ERROR(1006)
Rick
Gasper
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Mulnick,
Al
So that leads to the next question then: do you have a problem going on? If so, can you give some details?
Al
From:
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On Behalf Of Gasper,
Rick The application is called WebCT. www.webct.com. It is a distance learning app that runs off a web server. Their documentation is some what lacking, and their support is not really that good.
I do have everything set up as they request, so I was thinking that my problem is on my end.
I do have a support call scheduled with them later today. I wanted to try to rule out a AD problem.
Thanks
Rick
Gasper
From:
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On Behalf Of Mulnick,
Al
Sorry Rick. Thread overlap. :)
Whether or not you need to make a change depends on the application. For example, if they use the operating system to handle the authentication calls, then it should work fine, right? If they do something else, they should have documented it and should tell you what is needed. What is the application saying they need to do? Which application is it out of curiosity?
Al
From:
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On Behalf Of Gasper,
Rick I think we have a miscom here: I have no 5.5 server-- I assume that you mean exchange 5.5 (we are all ex2k3).
More details:
I have an app that runs on a win2k3 that uses either LDAP or Kerberos to authenticate it’s users against our 2003 active directory. The app server is part of our domain but the app that runs on it is a third party app that says it can authenticate using Kerberos or LDAP.
My question is: Do I need to do anything to our Domain controller to allow the app to talk to the domain controller?
Thanks, Rick
Gasper
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Mulnick,
Al
Before going any further, how about trying to get the information from a 5.5 server locally using the admin utility?
The goal of looking there is to isolate whether the problem is on the 5.5 side or if the problem is elsewhere; just need to rule out there's a problem with the 5.5 admin :)
Al
From:
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On Behalf Of Gasper,
Rick It is also windows 2003, but the software is a web app (webct). I am confused as the whether the OS it doing the authentication or the app is.
Rick
Gasper
From:
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On Behalf Of Mulnick,
Al
What OS is the remote system and how is it connected?
From:
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On Behalf Of Gasper,
Rick
Quick
question: Does anyone have place they could point me to? I have the Kerberos trouble shooting guide and am working through this. Thanks Rick Gasper
|
Title: Kerberos question
- RE: [ActiveDir] Kerberos question Gasper, Rick
- RE: [ActiveDir] Kerberos question Mulnick, Al
- RE: [ActiveDir] Kerberos question joe
- RE: [ActiveDir] Kerberos question Gasper, Rick
- RE: [ActiveDir] Kerberos question Gasper, Rick
- RE: [ActiveDir] Kerberos question Ken Cornetet
- RE: [ActiveDir] Kerberos question Mulnick, Al
- RE: [ActiveDir] Kerberos question Gasper, Rick
- RE: [ActiveDir] Kerberos question Mulnick, Al
- RE: [ActiveDir] Kerberos question Gasper, Rick
- RE: [ActiveDir] Kerberos question Mulnick, Al
- RE: [ActiveDir] Kerberos question Gasper, Rick
- RE: [ActiveDir] Kerberos question Gasper, Rick