Event ID - 21139

Event Id21139
SourceMicrosoft Firewall
DescriptionISA Server detected that IP address %1 was removed from network "%2".
Event InformationAccording to Microsoft

Cause:
The computer's network configuration has changed.
Resolution:
Verify that the change was intentional. If it was intentional, then you can ignore this event. If it was not intentional, then add the IP address back to the network. To to this, in the console tree of ISA Server Management click Configuration, then click Networks. In the details pane, click the Networks tab. In the details pane, select the network, from the right-click menu click Properties, then click Addresses.
Reference LinksEvent Id:21139 Source Id:Microsoft Firewall

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