DNS needing to be resolved twice for same host?

[talanoa]

On request #2 and #37, the same asset host seems to be firing off two dns requests. Does that make any sense?

http://www.webpagetest.org/result/130619...9/details/

[pmeenan]

It doesn't make any sense to me unless you've tripped over a browser or instrumentation bug. I recommend capturing a tcpdump (advanced settings) and verifying that the requests are actually being issued and then see if there is anything in the responses that might trigger it (like a really short TTL).