Duplicate SPN on Network

Last weekend I had to change our Sharepoint 2007 farm from NTLM to kerbose authentication. I'm new to Sharepoint and never did this before any why. I added all three of our sharepoint service account to all of the sharepoint sites / ports number for example the service account
SPAPP was added to
web
http/web:1000
http/web:33333
http/web:23405

The same process as done for the other two service accounts as well.. Today I just noticed ion my DC that I'm getting alot of KDC 11 error messages stating there are duplicate SPN on our domina. Did I break our AD enviroment? How serious are these error messages?

Anywaykerbose seems to be working on are sharepoint enviroment. But when I run the following command on are DC    setspn - x it comes back with 10 duplicate enteries for the http/webserver spn
How do I know when SPN to delete...

is an http spn only needed for the serices accoun that runs the app pool? if so do I need to register it for all port numbers??

Please help
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compdigit44Asked:
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compdigit44Author Commented:
But how do I know when SPN to leave???

my sharepoint farm uses three server.. web, index and sql server
I registered all three of my service account for my web on all of it web ports..

for example..

setspn -A http/webserver domain\serviceaccount
setspn -A http/webserver:1000 domain\serviceaccount
setpspn -A http/webserver:55555 domain\servicecoount
etc....

Now when I do the setspn -x command it comes back with 10 duplicate enteries...

Did I break my AD domain? How serious  of a problem is this? How do I know which SPN to remove and which shoudl stay?
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AwinishCommented:
No,don't worry just follow the spn name,even though you can delete spn name if you are not sure & reregister it.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;321044

In above link you can use 3rd option using script.

http://blogs.technet.com/askds/archive/2008/06/09/kerberos-authentication-problems-service-principal-name-spn-issues-part-2.aspx

You can remove & reregister it using setspn tool.
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compdigit44Author Commented:
Everything worked out perfectly
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