My system is the only DC and running Server 2012 R2 and is the only DNS server on a small network. There are 2 forwarders for internet name resolution and the root domains are also configured...all resolve without issue. Repeated simple & recursive test inquires all pass. The DNS timeout is set to 5 seconds.
On every network client, approximately one-third of forwarded lookups fail on the first attempt. The second attempt may get a response. By the third attempt, the name resolves. There appears to be no relation between the domain lookups which fail. In fact, the same domain may fail on one day but, after clearing the cache, the same lookup won't fail
No errors post to either the server or client event logs. I've removed the DNS service and reinstalled but the issue persists.
Any guidance is much appreciated.
Best,
Bill
Best,
Bill