If one of the following conditions is true, Internet Security and Acceleration (ISA) Server may not listen for Web proxy requests on the network adaptor or IP address:

•	You add or enable a network adaptor in ISA Server 2004 configuration settings.
•	You remove an IP address from a network adaptor and then add the same IP address again.
•	You find that ISA event ID 14148 is logged with an error code 0x80072740 in the event log. This event indicates that ISA cannot bind its socket to the Listing IP and Port because there may be another service that is already using this port.
•	After you experience a network disconnect on ISA, you cannot connect to the ISA listeners. For example, Web proxy requests fail.

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To work around this issue, restart the Microsoft Firewall service after you modify the network adaptor or IP address. To do this, follow these steps:

1.	Click Start, point to All Programs, point to Administrative Tools, and then click Services.
2.	In the list of services, right-click Microsoft Firewall, and then click Restart.

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: To resolve this issue, edit the SocketsInAcceptReuseList registry value to prevent this issue from occurring when you modify network adaptor settings or IP addresses in ISA Server 2004. To do this, follow these steps:

1.	Click Start, click Run, type regedit, and then click OK.
2.	Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\FwSrv\Parameters\SocketsInAcceptReuseList Note If this registry subkey does not exist, you must create it. To do this, follow these steps: a. Locate the following registry subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\FwSrv\Parameters b. Right-click this registry subkey, point to New, and then click DWORD Value. c. In the Name box, type SocketsInAcceptReuseList.
3.	Right-click SocketsInAcceptReuseList, and then click Modify.
4.	In the Value data box, type 0, and then click OK.
5.	Restart the Microsoft Firewall service. To do this, follow these steps: a. Click Start, point to All Programs, point to Administrative Tools, and then click Services. b. In the list of services, right-click Microsoft Firewall, and then click Restart.

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