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Frequently it is a problem that the Windows SPN is defined twice or more. You can use tools to locate duplicates. If you find a duplicate SPN, you should delete all but one.
Use this syntax to research your SPN:
ldapsearch -h <domain controller name> -D <administrator distinguished name> -w <administrator password> -b <starting point for the search> "serviceprincipalname=<YourSPN>" dn
For example, to research your SPN HTTP/www.renovations.com:
ldapsearch -h server1.ad.east.renovations.com -D "cn=administrator,cn=users,dc=ad,dc=east,dc=renovations,dc=com" -w myAdminstratorPw -b "dc=ad,dc=east,dc=renovations,dc=com" "serviceprincipalname=HTTP/www.renovations.com" dn
hope this helps,
Jane Marcus, IBM
Feedback response number JMAS973HJ5 created by ~Vanessa Brelutherflar on 04/24/2013
check for duplicate SPN
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. . . . . . check for duplicate SPN (~Tony Zekfootex... 24.Apr.13) 
