DNS Standard query response, Name Error
In the past 24 hours, it seems that almost all of the machines on my LAN are generating this alert from the ET DNS rules:
1:2001117 - ET DNS Standard query response, Name Error
Why would this happen all of a sudden? I see the PCRE in the rule that this is looking for, but I don't understand the rationale behind it.
Thanks for any information you may have to offer.