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Title : Windows Server 2003
  Topic : Setting reserved ports (to prevent dynamic port allocation from overtaking the listening socket of another process utilization a static port within a dynamic range)
  Created on : Sep 18 2009

modify the following reg key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ReservedPorts

Common ports that should be proactively reserved:

  • 1645-1646 - Used by IAS
  • 1701-1701 - Used by L2TP
  • 1812-1813 - Used by IAS
  • 2883-2883 - Used by AUTD
  • 4500-4500 - Used by IPSEC