Mike Volodarsky's Blog

Azure, IIS, ASP.NET, and LeanSentry

Troubleshooting

The master guide to proactive IIS monitoring

January 11, 2022 by mvolo Leave a Comment

Tired of monitoring dozens of metrics that produce no actionable value, and then still struggling with website outages?

After 10 years of solving IIS performance problems at LeanSentry, we’ve developed a practical model for tuning IIS website performance. Get the full system in our new IIS monitoring guide.

Posted in: .NET, How-To, IIS, LeanSentry, Performance, Troubleshooting Tagged: ASP.NET, Guides, IIS, LeanSentry, Performance, Troubleshooting

When CPU profiling goes bad in production

June 4, 2015 by mvolo 3 Comments

This week’s How-To: recover from a failed CPU profiler that has frozen your process in production. Plus a trick to temporarily suspend/resume any process you don’t want to be running.

Posted in: How-To, Troubleshooting Tagged: ASP.NET, How-To, IIS, Troubleshooting

Low Pagefile can cause 503 Service Unavailable on Azure web roles

May 8, 2015 by mvolo 6 Comments
503 Service Unavailable caused by Connection_Abandoned_By_ReqQueue

Is your Azure web role throwing 503 Service Unavailable? It could be because of a poor default Pagefile size.

Posted in: Azure, IIS, Troubleshooting Tagged: Azure, IIS, Troubleshooting

New Hang diagnostics for IIS & ASP.NET apps

May 6, 2015 by mvolo 2 Comments

LeanSentry’s new Hang diagnostics are out! This was a major rewrite of the diagnostic algorithm, and a complete redesign of the interface. Some of the biggest changes are …

Posted in: ASP.NET, IIS, LeanSentry, Troubleshooting Tagged: ASP.NET, IIS, LeanSentry, Troubleshooting

Re-inventing LeanSentry

April 13, 2015 by mvolo Leave a Comment

Hard to believe its been more than a year since my last post! I get a lot of “Hey Mike, what have you been up to?” email from this blog and the IIS troubleshooting newsletter, so I figured I should answer this question before getting back to business as usual. The short answer is, I’ve … [Read more…]

Posted in: ASP.NET, IIS, LeanSentry, Personal, Troubleshooting Tagged: ASP.NET, IIS, LeanSentry

IIS hang troubleshooting guide

October 8, 2013 by mvolo 1 Comment

Want to learn how to troubleshoot IIS website hangs the way Microsoft developers do it? Check out the new IIS hang troubleshooting guide.

Posted in: ASP.NET, CodeProject, Debugging, IIS, Troubleshooting Tagged: ASP.NET, Hangs, IIS, Troubleshooting

Let's fix production troubleshooting

September 17, 2013 by mvolo Leave a Comment

Production troubleshooting sucks. With LeanSentry, our vision has been to fix how IT and developers deal with production troubleshooting.

Today, this vision is getting even closer to being reality with automatic diagnostics for IIS website hangs, ASP.NET memory leaks, and many others.

Posted in: ASP.NET, CodeProject, IIS, LeanSentry, Troubleshooting Tagged: ASP.NET, IIS, LeanSentry, Troubleshooting

Everything you ever wanted to know about ASP.NET request queues

July 24, 2013 by mvolo 1 Comment

Did you know there are 5 places where ASP.NET requests can become queued on an IIS server? Learn all about these queues, and how to identify the actual queued requests!

Posted in: ASP.NET, CodeProject, Debugging, How-To, IIS, Troubleshooting Tagged: ASP.NET, IIS, Performance, Troubleshooting

The 4 server logs you NEED to know to fix any IIS / ASP.NET error

July 16, 2013 by mvolo 2 Comments

Having trouble finding that IIS or ASP.NET error in production? Learn to use these 4 server logs, and you will always find the error you are looking for.

Posted in: ASP.NET, CodeProject, How-To, IIS, Troubleshooting Tagged: ASP.NET, How-To, IIS, Troubleshooting

Fix the 3 silent performance killers for IIS / ASP.NET apps

July 10, 2013 by mvolo 33 Comments

If you could double your IIS/ASP.NET application performance by making just a few small tweaks, would you do it? Here are 3 high CPU problems for ASP.NET applications, that also happen to be easy to find and fix.

Posted in: ASP.NET, CodeProject, IIS, Performance, Troubleshooting Tagged: ASP.NET, IIS, Performance, Troubleshooting
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About me

I am the lead developer for LeanSentry, an expert application monitoring service for .NET web apps.

Before that, I used to work for Microsoft where I helped build the IIS 7.0 and ASP.NET products.

Expert IIS and .NET performance guides

  • How to reset and restart IIS correctly.
  • Get the best IIS application pool availability with warmup.
  • Turn on richer IIS logs for IIS log analysis on steroids.
  • Fix 503 queue full errors and improve RPS by tuning the IIS thread pool.
  • Tune high CPU usage in w3wp.exe.
  • Fix .NET memory leaks and tune w3wp memory usage.
  • Fix IIS and ASP.NET hangs, and async await hangs in ASP.NET core, MVC and WebAPI.

Recent Posts

  • Fixing W3WP.exe memory leaks is easier than you think
  • Async await hangs in ASP.NET Core, MVC and WebAPI
  • You may be massively overpaying for your CPUs
  • New guide to IIS and asp.net hangs
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