Reserving a Range of Network Ports (e.g., for IEDnet)

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.  Sometimes this is necessary to keep Windows services from grabbing the IEDnet ports, particularly the older ports of 1025 and 1026 which are still used in the NYCT installation.

Windows Server 2003 or Windows XP Professional

  1. Start Registry Editor (Regedit.exe).
  2. Locate and then click the following registry subkey:


  1. On the Edit menu, point to New, and then click Multi-string Value.
  2. Right-click the new value, click Rename, type ReservedPorts, and then press ENTER.
  3. 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:


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.

  1. Click OK.
  2. Quit Registry Editor.

Note You must restart the computer after you make these changes for the changes to take effect.