Impossible to access File server shares using a DNS alias

I am currently testing migration scenarios to replace 2 standalone W2K3 File Servers into 1 W2K8R2 Failover Cluster.
Everything went very well, shares are well accessible as long as I use the new File Server names, but...
... when I try to use DNS aliases (of the old servers), It is getting a nightmare!
First, each time I tried to to connect to the shares using the alias name \\tempsf\ I got an error message prompting for Duplicate name on the network.
I solved this first issue by applying the DisableStrictNameChecking
reg key (see below). The Duplicate name error message disappeared and I was able to access to the \\tempsf\ folder but it was empty however I have 2 shares well displayed when accessing it through the real file server name. Moreover, I confirm that :
ping tempsf resolves correctly the real file server name and IP
nslookup tempsf do the same
net view \\realfileserver displays my 2 shares
net view \\tempsf doesn't display anything :-(
Then, I almost tried everything currently documented :
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters Add a new DWORD value called DisableStrictNameChecking and set to 1.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters Add a new Multi-String value called OptionalNames. Enter one or more aliases, one per line.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters Add a new DWORD value called DisableLoopBackCheck and set to 1.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0 Add a new Multi-String Value BackConnectionHostNames. Enter one or more aliases, one per line.
And also the SETSPN:
setspn -A host/<your_ALIAS_name> <ServerrName>
setspn -A host/<your_ALIAS_name.domain.com> <ServerNname>
But still nothing... Launch date is approaching, I am feeling so desperate...
Any idea? please... Thanks in advance,
Max
PS : Ahh yes, one more thing, we are using a third-party DNS here (Infoblox) but I don't think it could be the issue.

Hello,
Configure my new File Server (new name, new IP)
Shutdown the old File Server
Map the mirrored SAN disk to the new File Server
Mount Storage and create shares (previously exported from old FS)
Update Alias to point to point to new FS (in Infoblox)
Update Reg keys, setspn and netdom as explained above
Try access. Shares well displayed when using new FS name but nothing when using updated alias despite dns resolution is ok.
I also found the following doc :
http://blogs.technet.com/b/askcore/archive/2009/01/09/file-share-scoping-in-windows-server-2008-failover-clusters.aspx?PageIndex=2#comments which explain precisely the way the W2K8R2 File Servers are working but without giving any solution to my issue.
Your doc was interesting but didn't help :-(
Anyone else ? Thanks

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If you wonder the root cause of the issue, the .NET Framework Class Libraries forum can help.
Best Regards,
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Impossible to access File server shares using a DNS alias

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