How do I prevent ASP.NET from logging authenticati

问题:

My Windows Azure web role ASP.NET MVC application serves REST API requests on some of the routes and those routes require "basic" authentication. Client programs often fail to authenticate - most of them are in the middle of being debugged - and so authentication failures are quite common. For every event I get a record like this in the Application log (accessible via Event Viewer or System.Diagnostics.EventLog class)

Date and Time Here (ASP.NET 4.0.30319.0): Event code: 100001
Event message: Authentication failure
Event time: Date and time
Event time (UTC): UTC date and time
// lots of information follows

I'm sure I'll never read those messages and writing them consumes some CPU time and IO bandwidth on the service VMs.

How do I get those failures not logged?

回答1:

This behavior is configured using <system.web><healthMonitoring> element in web.config. The default behavior is logging all unhandled exceptions and authentication failures to Application event log. There're two "rules" - one for the former and one for the latter.

So I just added this:

<healthMonitoring>
  <rules>
    <clear />
  </rules>
</healthMonitoring>

which made those default rules disappear and the problem is solved for me. Note that this also removes the rule for logging unhandled exceptions which I don't need either.