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Event ID: 6268 Source: DNS

Source
Level
Description
The global query block list is a feature that prevents attacks on your network by blocking DNS queries for specific host names. This feature has caused the DNS server to fail a query with error code NAME ERROR for WPAD.{yourdomain}.com even though data for  this DNS name exists in the DNS database. Other queries in all locally authoritative zones for other names that begin with labels in the block list  will also fail but no event will be logged when further queries are blocked until the DNS server service on this computer is restarted. See product documentation for information about this feature and instructions on how to configure it.

Below is the current global query block list  (this list may be truncated in this event if it is too long):
wpad
isatap.
Comments
 
On my system this seemed to be caused by having a blank TXT record in DNS for WPAD.  WPAD seems to be used by ISA server in configuring a Web Proxy as per "How to configure WPAD Support for ISA Firewall Web Proxy and Firewall Clients" article.

Deleting the TXT record from DNS eliminated this error.
See the comments for event id 7600 from DNS.

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