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Asked: 2026-05-11T10:56:24+00:00

I have an IIS7 web application which primarily serves web service requests. As part

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I have an IIS7 web application which primarily serves web service requests. As part of our solution we have two web servers and a load balancer, and the load balancer requests a page from each of its load balanced boxes periodically. The page the load balancer loads is named ‘Health.aspx’, it does not have a code behind, and the entire contents of the file Health.aspx is:

OK

However we are observing occasional 400 errors from the load balancer when requesting this page throughout the day which causes the load balancer to eject the machine from its rotation for a period of time.

While there are potentially a number of things which could be causing a problem here I wanted to start at the web boxes themselves and determine whether a nearly empty *.aspx page with no code behind could cause periodic problems.

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  1. Turns out that the problem was just the sheer number of requests and an untimely response time (or really request time – our client connections are very slow) for handling the requests. Requests for Health.aspx were getting caught up with slow client connections and the default MaxConcurrentRequestsPerCPU of 12 was artificially limiting our actual number of requests/second. Increasing this number to 100 – based on carefully testing our hardware against load for our particular application – solved the problem.

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