SPN - If HTTP, do I need to add all these URL's?

I have a 2 node 2003 cluster of IIS6 and this web application.  The cluster is built, but I get periodic reports that authentication is not working.  So I send them to the server name rather than the VIP name and all is well.  

After some research, I find that I need to run setspn and add in all the URL's for this web app.  I think this is true, but I find that the Metadata.xml file is forcing them to use NTLM.  I thought that the SPN's are only to be set for all URL's if kerberos was the authentication type.

Please help me, we are having an office discussion about this and I am being told that I do not need this.

If this is not it, how can I troubleshoot the fact that IE is not passing the credentials always when using the VIP address rather than the URL to an individual server.

Thanks,
Stowy

LVL 1
Todd MostowyAmericas Regional IT ManagerAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

raterusCommented:
SPN's are only needed if your users are accessing the webserver using a fully qualified domain name

e.g.
http://intranet.mydomain.com

And yes, they work with Keberos authentication.  The authentication will try Keberos first, and if that fails, will resort to NTLM.

You also need a checkbox in IE checked "Enabled Integrated Windows Authentication", or it definitely won't use Keberos!
0
Todd MostowyAmericas Regional IT ManagerAuthor Commented:
So my question is this..   So I need to enter in ALL URL's that the users enter with this setspn tool?
0
raterusCommented:
Only if they are fully qualified, but yes, if they are fully qualified, and you hope to use integrated windows authentication with it, you have to enter them.

Got the syntax of the command down?
setspn -a HOST/intranet.mydomain.com MYWEBSERVERNAME
setspn -a HTTP/intranet.mydomain.com MYWEBSERVERNAME



0
The Five Tenets of the Most Secure Backup

Data loss can hit a business in any number of ways. In reality, companies should expect to lose data at some point. The challenge is having a plan to recover from such an event.

Todd MostowyAmericas Regional IT ManagerAuthor Commented:
when I do the setspn -l servername command, it should list all the URL's if they were entered correctly, right?
0
raterusCommented:
yes, you should see something spit out like I posted last.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Todd MostowyAmericas Regional IT ManagerAuthor Commented:
Thank you!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft IIS Web Server

From novice to tech pro — start learning today.