How to reserve ports and range of ports on windows server.

In some situations, you may want to reserve a range of ports so that a program or application process that requests a random port and same will be assigned a port which is not in the reserved range. 

When you reserve a range of ports, only a program or process that specifically requests a port that is in the reserved range can be use the port.

Windows 2003 server

To reserve a range of ports so that only a program or process that specifically requests a port that is in the reserved range can use the port, follow these steps.

Start Registry Editor (Regedit.exe).

Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

On the Edit menu, point to New, and then click Multi-string Value.

Right-click the new value, click Rename, type ReservedPorts, and then press ENTER.

Double-click the ReservedPorts value, type the range of ports that you want to reserve, and then click OK.

Note You must type the range of ports in the following format:

xxxx-yyyy

To specify a single port, use the same value for x and y. For example, to specify port 4000, type 4000-4000.

Warning If you specify the continuous ports separately and if one port is reserved and not used, the next port is not correctly reserved, and it is used.

Click OK.

Quit Registry Editor.

WINDOWS 2008 Server

netsh int ipv4 show dynamicport tcp

netsh int ipv4 set dynamicport tcp start=9999 num=55000