Problem accessing QNAP using alias instead of hostname from Windows 2012 R2 Server

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We have QNAP in place with the hostname QNAP01.  The Qnap has the latest firmware and is joined to the AD Domain.  We have the DNS entry for QNAP01 and also a CNAME ARCHIV in DNS.  From our Windows 7 and Windows 2008 R2 the users connect to the Qnap using the name \\archiv.  

Now we have a Windows 2012 R2 Citrix farm where the users can't connect using the alias \\archiv.  They get a authentication prompt.  When they enter their credentials they still cannot connect to the Qnap.  But when they enter the hostname \\qnap01 they can connect without any issues.

Please advise.
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TRY below
Connect to the NAS via SSH with the user admin.
Edit the file /etc/config/smb.conf and add the line :
netbios aliases = newalias
You can add it after [global]
save the file and restart samba by : /etc/init.d/ restart

After that, you should be able to access with alias

Also make sure there will be dns entry for above alias

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