Hi Gerry,
One day about a week or so ago I started seeing these in my logs over and over every few minutes from a range of ip addresses, it is a bad request, I mean if you enter the url in the browser http://yoursiteroot/ScriptResource.axd it will create and log an error.
What I did was open a text file and make a sequential list of all the ip addresses I saw causing this error, I kept my eye on the log off and on through the day and whenever I saw a new ip with that error I added it to the list, they were all in a specific range, after I was pretty sure I had them all listed I went through and banned them 1 by 1 because this is not normal traffic and it is coming from China. It is not doing any harm other than being a nuisance but I figure its better to ban them than to let them keep going logging these errors like clockwork. I figure if they get an access denied response for long enough they will eventually give up and leave me alone.
Best,
Joe