[OpenAFS] OpenAFS for Windows 1.5.72, Windows 7, VPN session killing

[Jeffrey Altman]

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On 3/13/2010 6:51 AM, Jeff Blaine wrote:
> Jeffrey,
>=20
> I've been using the VPN software on this box with no problems
> for 2 weeks now.

And the rest of us have been running OpenAFS and KFW for many
years and have done so in conjunction with Cisco VPN software on
XP and Vista.  So why is the problem the fault of OpenAFS or KFW?

> I finally got around to installing OpenAFS + KfW yesterday.
>=20
> After installing OpenAFS + KfW, it continues to work fine until
> I tickle OpenAFS, at which point the VPN session drops.

You have an interop problem that you cannot explain but
how do you expect anyone to be able to help you when you
describe your problem in such absolute terms such as "tickle"?

So far you have stated:

1. the problem is KFW

2. the problem is NetIdMgr

3. the problem is OpenAFS because there are two loopback adapters

4. the problem is the OpenAFS authentication tool, afscreds

5. the problem is OpenAFS when it is tickled

Keep in mind that the Microsoft Loopback Adapter is active from the
moment that the machine boots and that the OpenAFS Service is also
active from boot time.  If the VPN software, which is started later
works for some period of time and then drops, it is most likely not
due to the installation of those packages.

In the NetIdMgr v2 log that you sent to kerberos@mit.edu, you said
that the VPN disconnect occurs at a particular time.  In the log at
that time the MSLSA credential cache is being accessed in an attempt
to import a TGT which is not present on your machine because you are
using a non-Domain logon.

You then later on said that the problem wasn't NetIdMgr but was instead
OpenAFS because the problem occurs when you start the AFS Authentication
Tool (afscreds).  As I pointed out on the kerberos@mit.edu mailing list,
afscreds is a Kerberos v5 credential manager and it also attempts to
import a TGT from the MSLSA: credential cache.  Both tools do so in
an attempt to obtains AFS tokens for the user without prompting the
user to enter a principal and password.

What I bet is that you will find that if OpenAFS is uninstalled and the
loopback adapter is uninstalled and NetIdMgr is not running that the
problem can be reproduced by accessing the MSLSA credential cache using
the KFW command line tools:

  klist -c MSLSA:

  kdestroy -c MSLSA:

  ms2mit

  mit2ms

Assuming that I am right, someone with a debugger and access to the
Cisco software can step through the MSLSA credential cache and identify
exactly which Lsa operation is being executed that produces the
disconnect.  At that point Cisco and perhaps Microsoft will need to be
brought into the discussion by the customer to identify how the MSLSA
access is affecting the Cisco VPN connection.  Attempts to obtain a TGT
from an empty cache will cause Windows to attempt to obtain one from a
KDC.  For a non-domain logon this should be a no-op.  Perhaps there is a
bug in Windows, perhaps it is the VPN software being sensitive to
something it shouldn't be.

Jeffrey Altman




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