Why does a SPN on a different host cause a server to lose its trust? How should I fix it?
I have a brand new server image that loses its trust as soon as it's joined to the domain. I suspect it's because of the duplicate SPN I discovered using the LDAP version of this Powershell script
Powershell script
#Set Search
cls
$search = New-Object DirectoryServices.DirectorySearcher([ADSI]“”)
$search.filter = “(servicePrincipalName=*)”
$results = $search.Findall()
#list results
foreach($result in $results)
{
$userEntry = $result.GetDirectoryEntry()
Write-host "Object Name = " $userEntry.name -backgroundcolor "yellow" -foregroundcolor "black"
Write-host "DN = " $userEntry.distinguishedName
Write-host "Object Cat. = " $userEntry.objectCategory
Write-host "servicePrincipalNames"
$i=1
foreach($SPN in $userEntry.servicePrincipalName)
{
Write-host "SPN(" $i ") = " $SPN $i+=1
}
Write-host ""
}
Host with duplicate SPN
dn: CN=NYC01IMFE02,CN=Computers,DC=hp,DC=com
changetype: add
servicePrincipalName: MSSQLSvc/NYC01IMFE02.hp.com:52407
servicePrincipalName: MSSQLSvc/NYC01IMFE02.hp.com:LYNCLOCAL
servicePrincipalName: MSSQLSvc/NYC01IMFE02.hp.com:59066
servicePrincipalName: MSSQLSvc/NYC01IMFE02.hp.com:RTCLOCAL
servicePrincipalName: http/nyc01imfe02.hp.com
servicePrincipalName: sip/nyc01imfe02.hp.com
servicePrincipalName: TERMSRV/NYC01IMFE02.hp.com
servicePrincipalName: TERMSRV/NYC01IMFE02
servicePrincipalName: WSMAN/NYC01IMFE02
servicePrincipalName: WSMAN/NYC01IMFE02.hp.com
servicePrincipalName: RestrictedKrbHost/NYC01IMFE02
servicePrincipalName: HOST/NYC01IMFE02
servicePrincipalName: RestrictedKrbHost/NYC01IMFE02.hp.com
servicePrincipalName: HOST/NYC01IMFE02.hp.com
servicePrincipalName: TERMSRV/NYC01EXCAS04
servicePrincipalName: TERMSRV/NYC01EXCAS04.hp.com
servicePrincipalName: RestrictedKrbHost/NYC01EXCAS04.hp.com
servicePrincipalName: HOST/NYC01EXCAS04.hp.com
servicePrincipalName: RestrictedKrbHost/NYC01EXCAS04
servicePrincipalName: HOST/NYC01EXCAS04
Host I just created
dn: CN=nyc01excas04,CN=Computers,DC=hp,DC=com
changetype: add
servicePrincipalName: WSMAN/NYC01EXCAS04
servicePrincipalName: WSMAN/NYC01EXCAS04.hp.com
servicePrincipalName: TERMSRV/NYC01EXCAS04
servicePrincipalName: TERMSRV/NYC01EXCAS04.hp.com
servicePrincipalName: RestrictedKrbHost/NYC01EXCAS04
servicePrincipalName: HOST/NYC01EXCAS04
servicePrincipalName: RestrictedKrbHost/NYC01EXCAS04.hp.com
servicePrincipalName: HOST/NYC01EXCAS04.hp.com
Question
- What would cause these entries to be located on the wrong host?
.
servicePrincipalName: TERMSRV/NYC01EXCAS04
servicePrincipalName: TERMSRV/NYC01EXCAS04.hp.com
servicePrincipalName: RestrictedKrbHost/NYC01EXCAS04.hp.com
servicePrincipalName: HOST/NYC01EXCAS04.hp.com
servicePrincipalName: RestrictedKrbHost/NYC01EXCAS04
servicePrincipalName: HOST/NYC01EXCAS04
What is the meaning of those entries? What are they used for
Would they have caused a trust failure in the new machine? Why is it that only one machine has issues, and not the other
How do I correct the issue?
Basically, setspn
in a proper functioning AD shows no duplicates. I think you should remove 'em at least for the troubled machine. Start with the troubled machine SPN's which miss the realm part.