Itt egy példa, amit anno mi is beszoptunk:
"We to had this issue but after following the information in https://support.microsoft.com/en-us/kb/3161949 and applying the correct registry change the issue was resolved.
After you install this security update, the following changes are applied: •NETBIOS communication outside of the local subnet is hardened. Therefore, by default, some features that depend on NETBIOS (such as SMB over NETBIOS) will not work outside the local subnet. To change this new default behavior, create the following registry entry:
SUBKEY: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Parameters
Value Name: AllowNBToInternet
Type: Dword
Value: 1
Default value of the flag: 0"
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robyboy