Port reservation on Windows Server 2008 and 2008 R2 included SBS 2011
2014
If you need to reserve a port in Windows Server 2008, 2008 R2 or SBS 2001 (which is in fact a 2008 R2), it does not make any sense to modify the registry value
ReservedPorts
at
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
as indicated at in the Microsoft KB 812873, because Windows Server 2008 and 2008 R2 does not support this setting anymore.
You need to request a hotfix from this page KB 2665809, install it and then you can control your port ranges with the commands (from an administrative command prompt of course):
netsh int ipv4 show excludedportrange protocol=tcp
to display active reservations, and add with
netsh int ipv4 add excludedportrange protocol=tcp startport=8000 numberofports=1
.
The command is documented at the MS KB page where you can find the hotfix.