Access Denied ADMIN$

 Your machine is on workgroup and you would like to access the machine via share/credential.

Example:

\\computername\share

\\computername\ADMIN$

and has key-in computername\username but failed to gain access. The password is correct yet unable to access via Share. 

If you've encountered the same scenario, you can try this on the machine and put these registry key

Open Registry Editor

1. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
2. On the Edit menu, point to New, and then click DWORD (32-bit) Value.
3. Type LocalAccountTokenFilterPolicy to name the new entry, and then press Enter.
4. Right-click LocalAccountTokenFilterPolicy, and then click Modify.
5. In the Value data box, type 1, and then click OK.
6. Exit Registry Editor.

This should do the trick and solve the problem