Close all ports. Reassign the port RDP. Modify the TTL. And most likely your system does not determine from the response).
Modify the TTL:
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters] DefaultTTL 64 DWORD
Reassign the port RDP (mstsc :3333):
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp] PortNumber 3333 DWORD
Reassign the VPN port:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\\0003] TCPPortNumber <VPN port number> DWORD
Disable IPv6
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters DisabledComponents 0xffffffff DWORD
command, disable IPv6 Teredo, 6to4, ISATAP:
netsh interface teredo set state disabled netsh interface ipv6 6to4 set state state=disabled undoonstop=disabled netsh interface ipv6 isatap set state state=disabled
Change response services, and so on and so forth ...
Close all not need ports.