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Event ID: 1001 Source: DNS

Source
Level
Description
The DNS server could not map file <file> to memory. Either close other programs that are not in use or reboot the computer to reclaim additional memory for the server to use.
Comments
 
Your computer might be low on memory. See MSW2KDB for additional information about this event.
I had this one coupled with EventID 1004 from the same source when the Primary Reverse Lookup Zone turned to Expired state. The workaround was to kill the Zone and recreate it.

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