Why is that link showing as 404 @ http://www.webpagetest.org/result/111117_SB_274B5/1/details/#request56
Can you show me an example of that URL actually being requested inside of a browser?
it is coming off this page http://myticketalert.com
Unless you can verify that a browser actually makes these requests, it appears that this is a bug with however webpagetest.org is conducting its test.