HTTPHandler 404 Under Heavy Load

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I have an ASP.NET application that uses both an HTTPModule and several
HTTPHandlers. This application is running in a web farm environment on
Windows 2003 Server using NLB.

Under somewhat heavy load (~25 req/sec) the application begins to return
HTTP 404 errors for requests of a specific handler. The other handlers
continue to work fine. This usually happens after about 30 minutes of
sustained load.

I don't think it is something in my code because I use this same code (or,
rather, very, very similar code) in several other applications - including
applications that handle close to 300 req/sec. I could, of course, be wrong.

Whatever the issue, it appears to be cumulative. Over the course of several
hours, eventually all machines in the server farm will start returning
nothing but 404's for that handler. In addition, once a machine has returned
a 404 for the handler, it always returns a 404.

If I recycle the app domain, or if I change the web.config or replace the
DLL, the application begins to work again.

Any ideas?

Thanks,
RMD
 
Just one quesiton....

what site is it that is getting 25 requests per sec? that is pretty huge
.....
that is 1500 hits per minute....
90,000 per hour.
2,160,000 per day
15,120,000 per week...
you ge the picture.....

that is an amazing amount of hits...... I would have only thought that sites
like
ms.com google ebay etc would get that kind of traffic..

It boggles the mind to think of a site that can do 300 req/sec
that is
18,000 per minute
1,080,000 per hour
25,920,000 per day

dont get me wrong.... i am not saying that you are going over board.... But
what site out there really gets 300 request per second? even an intranet
wouldnt hit close ?? or would it?
 
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