Re: Delegation through Linked Server Stops working

Thanks for posting back. How long has it been working? We
did the same thing at that client site and still had the
problems.

-Sue

On Fri, 8 Sep 2006 12:20:01 -0700, DallasBlue
<DallasBlue@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Things started working with the double hop after forcing the kerberos to use
TCP instead of UDP as in the article 244474 at
support.microsoft.com/kb/244474/

"Sue Hoegemeier" wrote:

Yup...a client site I was at had the issue and an open case
with PSS. At first I thought it was expiring tickets causing
the problem but then it looked more like it could be
duplicate/bad SPNs. We'd clean out AD and then find
duplicate SPNs errors after removing all dupes. Don't know
what else to tell you - I haven't seen anyone who has a
ticket open post a solution. And the place I was at never
got a resolution to the problem either.

-Sue

On Wed, 30 Aug 2006 14:50:03 -0700, DallasBlue
<DallasBlue@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

do have a ticket open with microsoft for more than a month now, but no
resolution yet. "Troubleshooting Kerberos delation" is nearly a 90 page doc.
tried a lot of things nothing seems to fix it....

"Sue Hoegemeier" wrote:

So then you followed everything in the troubleshooting
delegation doc? No one has every really posted any
resolution. I had posted a lot of steps Microsoft will have
you do when/if you open a ticket. That's about all I know
about it. It's not really a SQL issue, it's a kerberos
issue. Whether it's AD problems or issues with tickets
expiring, it's hard to say.

-Sue

On Tue, 29 Aug 2006 14:38:02 -0700, DallasBlue
<DallasBlue@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

yes, when we restat the nodes the kerberos delegation starts to work for few
minutes and then stops with the 'login failed reason (null)' error....

"Sue Hoegemeier" wrote:

Are you having a completely different issue?
This post was about delegation working and then suddenly
failing until a reboot. Is this your issue?

-Sue

On Sun, 27 Aug 2006 12:23:01 -0700, DallasBlue
<DallasBlue@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Is there a solution for this issue.

delegation on linked server fails in our network when we use
nt-authenticated logins. we have a sql server 2000 nodes (n1,n2) on win 2003
cluster.

Any thots,hints,links,pointers appreciated

thanks,
GA

"Sue Hoegemeier" wrote:

A few others have reported similar issues - with no
solutions. I worked at a place where we had delegation
sporadically failing and then working after reboots. A
ticket was opened with Microsoft but the issue was never
resolved. I would guess it's a Kerberos issue, not a SQL
issue. Make sure AD is clean and you don't have duplicate or
bad SPNs for all machines involved. Make sure all machines
involved have times sync working correctly, using the same
time server.
I'd suggest getting the Kerberos Delegation troubleshooting
doc available at:
http://www.microsoft.com/downloads/details.aspx?FamilyID=99b0f94f-e28a-4726-bffe-2f64ae2f59a2&DisplayLang=en
We also installed a tool that would do verbose logging for
Kerberos errors - I just looked and couldn't find the tool.
Maybe if someone else knows they will jump in and provide a
link for that tool.
It can be a difficult issue to troubleshoot and you may want
to consider opening up a support ticket with Microsoft
Product Support.

-Sue

On Wed, 16 Aug 2006 12:43:01 -0700, Sheriff
<Sheriff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

I have a Linked Server from SQL 2005 to a SQL 2000 server. I have it
configured to use delegation. This will work fine for a while and then
suddenly stop working. Sometimes it works for an hour, sometimes for a day.
I have to restart the SQL 2005 server and it will begin to work again. The
error is:

TCP Provider: An existing connection was forcibly closed by the remote host.
Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection.

Any ideas?









.

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