My $.02
Having the ONTAP version would be helpful here.
A few thoughts of my own, based on my history with ONTAP and
CIFS:
Thu Jan 26 15:03:35 MST [cifs.trace.GSS:error]: AUTH: Unable
to acquire filer credentials: (0x96c73a44) KRB5 error code 68. ß This error
is indicative of the DC not liking the filer SPN, from what I can gather.
Your filer isn’t using Kerberized NFS by chance is
it? The other possibility of the above error would be using a different KRB
realm – having an NFS and CIFS realm that do not match was only recently
supported (if that version is out yet).
Thu Jan 26 15:04:39 MST [auth.dc.GetDCName.failed:error]:
AUTH: Error 0x0 while trying to get Domain Controller name for ß I feel that
this error is indicative of the filer not being able to connect to the DC. If
this were a simple DNS\WINS error, I don’t believe that it would be under
the auth threads. A PKTT during the issue would be IMMENSELY helpful here.
Glenn
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Hill, Aaron
Sent: Thursday, January 26, 2006
8:19 PM
To: 'Lai, Derek';
markallen@micron.com; toasters@mathworks.com
Subject: RE: CIFS PDC Issues
Yeah, we saw something like this a few
times with Win2k AD DC's periodically last year. The issue was intermittent and
could affect 1 filer in a cluster even though they had the same settings.
Deep analysis was done involving
packet traces, Microsoft/NetApp escalation concalls and
stubbornly attempting to reproduce the issue in a lab without
success.
The root cause was never fully determined
and the only fix we had was reactive ..... cifs resetdc to re-establish
the authenticated pipe with the DC's.
Essentially, anyone with an existing CIFS
session established was ok. They could operate as per normal. It was clients
attempting new connections that were met with the "Access is
denied" message. Do you know if ALL sessions were affected, existing AND
new?
Our problem may have been a little
different to you in that we had a defined prefdc list of 5 DC's. It seemed
that if 1 DC "authentication pipe" shutdown with the filer, the filer
was not smart enough to move onto the next one in the list. This is essentially
because the only way a DC was tested as being "available" was by a
ping test. Something they call DCPING as part of the Filer AD site awareness.
NetApp did release a fix in 6.5.6 (or
maybe a slightly earlier P release) that made the DC test a little smarter. I
believe it now uses the ability to establish a pipe as an available DC
criteria. We haven't had any reported incidents in the past few months, so it
may have helped. It is hard to say due to the intermittent nature.
I will try and track down our original
case number if it helps.
Thu Jan 26 15:03:35 MST [cifs.trace.GSS:error]: AUTH: Unable
to acquire filer credentials: (0x96c73a44) KRB5 error code 68. -----> This
is very similar to the error we would see just before connections dropped for
the clients.
Thu Jan 26 15:03:35 MST
[cifs.server.infoMsg:info]: CIFS: Warning for server \\WNTNANI: Connection terminated ----> This happens regularly and isn't
anything to be concerned about. EXCEPT apparently when it follows the previous
message and no sessions are attempted to be established with other DC's.
The other messages look familiar, but I can't be sure.
What does your "testdc" return?
Does this affect all filers or only some? i.e. Like one
cluster partner affected without the other.
Are your DC's experiencing any issues? i.e. Are the Domain
Controller services and dependent services all up and running? Can you connect
to a share on your domain controllers directly when this happens?
Good luck,
Aaron
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Lai, Derek
Sent: Friday, 27 January 2006
10:14 AM
To: markallen@micron.com;
toasters@mathworks.com
Subject: RE: CIFS PDC Issues
Are the times synced up between filer and
the domain controllers? Kerberos is very time sensitive.
Derek
From: owner-toasters@mathworks.com
[mailto:owner-toasters@mathworks.com] On
Behalf Of markallen@micron.com
Sent: Thursday, January 26, 2006
2:13 PM
To: toasters@mathworks.com
Subject: CIFS PDC Issues
Today
I had several filers at different OS levels stop serving data via CIFS with the
following errors. I had to stop and restart CIFS to get CIFS working properly.
The filer acted as if its kerberos ticket wasn't valid with any of the domain
controllers. Has anyone seen this before?
Cifs
domain info command:
Not
currently connected to any DCs
Preferred
Addresses:
None
Favored
Addresses:
ip
WNTNABO2 PDCBROKEN
ip WNTNABO1
PDCBROKEN
Other
Addresses:
ip WNTNABO4
PDCBROKEN
ip WNTNACRUBO1 PDCBROKEN
/etc/messages
output:
Thu
Jan 26 15:03:35 MST [cifs.trace.GSS:error]: AUTH: Unable to acquire filer
credentials: (0x96c73a44) KRB5 error code 68.
Thu
Jan 26 15:03:35 MST [cifs.server.infoMsg:info]: CIFS: Warning for server \\WNTNANI: Connection terminated.
Thu
Jan 26 15:04:07 MST [auth.dc.GetDCName.failed:error]: AUTH: Error 0x0 while
trying to get Domain Controller name for
Thu
Jan 26 15:04:32 MST [sshd_0:info]: Did not receive identification string from
x.x.x.x
Thu
Jan 26 15:04:39 MST [auth.dc.GetDCName.failed:error]: AUTH: Error 0x0 while
trying to get Domain Controller name for
Thu
Jan 26 15:05:11 MST [auth.dc.GetDCName.failed:error]: AUTH: Error 0x0 while
trying to get Domain Controller name for .
Thu
Jan 26 15:05:43 MST [auth.dc.GetDCName.failed:error]: AUTH: Error 0x0 while
trying to get Domain Controller name for
Thu
Jan 26 15:07:01 MST [sshd_0:info]: Did not receive identification string from
x.x.x.x
Thu
Jan 26 15:09:32 MST [sshd_0:info]: Did not receive identification string from
x.x.x.x
Any
insight into this would really help me out. I have a case open with Netapp as
well.
-Mark
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