Enterprise manage not connection to Veeam servers ( 2008 sp1 and higher ) in a untrusted domain or Work group. Every time I connected using the local user of the remote Veeam server I got Access denied in the VeeamBES.log. The problem is the UAC access token filtering will not affect the domain accounts but will affect local accounts.
To fix this:
Disabling Remote UAC by changing the registry entry that controls Remote UAC.
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[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\system\LocalAccountTokenFilterPolicy]
Set the value is 1, remote UAC is disabled. When the value of this entry is zero (0), Remote UAC access token filtering is enabled.
3. Restart the Windows 2008 server
Or run the .reg file
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Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"LocalAccountTokenFilterPolicy"=dword:00000001
Tested on two remote Veeam servers and it fixed the connection the Veeam enterprise server upon reboot.