CNAME Redisrects not operational for some machines after Virtualisation

Hi experts,

We are in the middle of a virtualisation project and are facing an issue with a cname redirect.  We created a new 2012 file server with new name and used robocopy to copy over files and permissions, exported and reimported the shares.  We then shut down the old machine (windows 2003), updated the IP address on the new machine and created a cname entry in DNS to point the old server name to the new one.

The issue occurs with several machines on the domain.  A ping to the old server name resolves without any issues on all machine but on around 10% of the machines they are unable to access the files on the file server.

We have checked permissions, etc and can not find the reason for this.  Any help would be appreciated..
iCS_SupportAsked:
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footechCommented:
Any difference in the 10% of machines that are having problems, like running XP?

Have you created the SPNs to match the CNAME so Kerberos works?  Here's a decent guide.
https://www.md3v.com/enable-windows-server-smb-2-0-alias-cname

I'm not sure if the registry entry for DisableStrictNameChecking (set on the server) is needed for Vista+ clients.

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iCS_SupportAuthor Commented:
Hi footech,

We didnt run the SPN command but had entered the registry for the DisableStrickNameChecking.  Will run the SPN and confirm back.  

Thank you.
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