The ISACTRL service may not start when you enable or disable packet filters, you may receive an Event ID 11002 error message, and Event Viewer may contain an error message that is similar to the following error message:
Event Type: Error
Event Source: Microsoft ISA Server Control
Event Category: None
Event ID: 11002
Date: date
Time: time
User: N/A
Computer: computer name
Description:
Microsoft ISA Server Control failed to start. The failure occurred during
Reading packet filters because the configuration property RemoteHostIPMask of key SOFTWARE\Microsoft\Fpc\Arrays\{CD784045-CBFF-4306-8E2E-1F99141E034B}\ArrayPolicy\Proxy-Packet-Filters\{e963fc32-3df4-4a80-92fa-f7ab9c6152f0} is not valid. Use the source location 107.2798.3.0.1200.50 to report the failure. The error code in the Data area of the event properties indicates the cause of the failure.
For more information about this event, see ISA Server Help.
The error description is: An invalid argument was supplied
For more information, see Help and Support Center at http://support.microsoft.com.
Data:
0000: 26 27 07 80