Server 2012R2 local administrators

I have a Server 2012 R2 standard in a DMZ, NOT JOINED TO AD. I've opened up SMB port 139 so I can UNC into it and upload some files. I've disabled the builtin "Administrator" account as per my usual and created my own local account "Dude" and added to local administrators group.

UNC into the server \\servername\c$ only works if I use the builtin "Administrator" account - after enabling it of course. Attempts to use any other manually created local admin account fails.

I also have this same issue trying to use Symantec BESR for backups, it only works if i use the local builtin "Administrator" account.

Please advise and thank you.
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AHECAuthor Commented:
Got it:

Click Start, type regedit in the Start Search box, and then click regedit.exe in the Programs list.
Locate and then click the following registry subkey:
On the Edit menu, point to New, and then click DWORD Value.
Type LocalAccountTokenFilterPolicy for the name of the DWORD, and then press ENTER.
Right-click LocalAccountTokenFilterPolicy, and then click Modify.
In the Value data box, type 1, and then click OK.
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