Problem with kerberos - kvno getting bumped..
Karuppiah, Deepak
dkaruppiah at microstrategy.com
Wed Oct 20 14:11:06 EDT 2010
The password is indeed reset automatically as per this blog article from
MSFT folks which explains the increments in KVNO.
http://blogs.msdn.com/b/openspecification/archive/2009/11/13/to-kvno-or-
not-to-kvno-what-is-the-version.aspx
I am not certain if that is true if the Linux box turned off.
Thanks,
-Deepak
-----Original Message-----
From: kerberos-bounces at MIT.EDU [mailto:kerberos-bounces at MIT.EDU] On
Behalf Of Eric Youngdale
Sent: Wednesday, October 20, 2010 12:37 PM
To: kerberos at MIT.EDU
Subject: Problem with kerberos - kvno getting bumped..
I have a Linux (Ubuntu) box joined to a Windows domain (I
believe the domain controllers are server 2003) so I can use Kerberos
authentication. Initially everything is working fine - I can ssh into
the box using gssapiauthentication.
After some number of days, this stops working however. I
would find that I could re-generate the keytab and the problem would go
away for a while and eventually come back. The most recent time I
noticed that it stopped working on a Monday morning - implying perhaps
that something changed over a weekend.
I build the Kerberos libraries with optimization turned off so I could
step through, and what became clear was that the KVNO for the machine
account had changed - in AD the number was now 30, but the keytab had a
KVNO of 24. So it wasn't just one bump - there were several (the keys
were generated on 09/25/10).
At this point, I don't know *why* the kvno is changing. Right now I
have a script running that polls the KVNO every 5 minutes so I can see
exactly when the thing changes - once I have a time, I can start looking
at logs (both on the Linux box and perhaps even on the domain
controller). For that matter, I could probably shut down the Linux box
for a few weeks to see whether the KVNO bumps happen without the machine
being up or not.
Does anyone have anything else to suggest for what I should
be looking for?
-Eric
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