To resolve this problem, add the port that is needed by the service to the ReservedPorts registry value. This prevents the DNS Server service from listening on that port. The following ports are known to cause conflicts: Collapse this tableExpand this table Ports Program that uses the ports 1645-1646 IAS 1701-1701 L2TP 1718-1719 H.323 Gatekeeper (ISA 2000 only) 1745-1745 ISA Server 2000 or ISA Server 2004 1812-1813 IAS 2883-2883 AUTD 3500-3619 ISA Server 2000 only 4500-4500 IPSEC To configure the ReservedPorts registry value, follow these steps:
1. Click Start, click Run, type regedit, and then click OK. 2. Locate and then click the following subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters 3. Right-click ReservedPorts, and then click Modify. 4. Type the range of ports that you want to reserve.
Notes * You must type the range of ports in the following format: xxxx-yyyy * Do not replace the existing values. Instead, add the additional values. * To specify a single port, use the same value for x and for y. For example, to specify port 4000, type 4000-4000. * If you specify the continuous ports separately and if one port is reserved and is not used, the next port is not reserved correctly, and the port is used. * ISA Server settings only apply to Small Business Server 2000 or to Windows Small Business Server 2003 Premium Edition. 5. Click OK.