LeanSentry: A better monitoring service for Windows server web apps
We've spent the last 5 years helping our clients build better websites on the Microsoft web platform. Eventually we got sick of logging into servers to debug IIS problems with appcmd, EventLog, windbg,...
View ArticleThings you still can’t do with ASP.NET modules on IIS
Even with the ASP.NET Integrated Pipeline on IIS, there are things you just can't do with ASP.NET modules. Here is a list of them, and why you should probably never do them.The post Things you still...
View ArticleSearch your entire IIS / ASP.NET web application stack
At LeanSentry, we are all real ASP.NET engineers. So often, we do very engineer-like things. Like building features that we ourselves want to use to run our own web applications. This week, we...
View ArticleCrack down on 404 errors in your web apps
404 Not Found is the most common error for production web applications. Turns out, they can often signal real production problems! Read on to learn about 4 types of Not Found errors you should find and...
View ArticleFix the 3 silent performance killers for IIS / ASP.NET apps
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...
View ArticleThe 4 server logs you NEED to know to fix any IIS / ASP.NET error
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.The post The 4 server logs you NEED to know to...
View ArticleEverything you ever wanted to know about ASP.NET request queues
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!The post Everything you ever...
View ArticleLet’s fix production troubleshooting
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...
View ArticleIIS hang troubleshooting guide
Want to learn how to troubleshoot IIS website hangs the way Microsoft developers do it? Check out the new IIS hang troubleshooting guide.The post IIS hang troubleshooting guide appeared first on Mike...
View ArticleInfographic: Debugger vs. Profiler? Fixing slow ASP.NET page loads
We put together a fun infographic to compare using the debugger vs. a profiler for troubleshooting slow page loads in ASP.NET apps. This coincides with our recent release of LeanSentry's slow operation...
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Re-inventing LeanSentry
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...
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New Hang diagnostics for IIS & ASP.NET apps
Hang diagnostics 2.0 are out for ASP.NET apps! This was a major rewrite of the diagnostic algorithm, and a complete redesign of the interface. Some of the biggest changes: 1. Visualize IIS/ASP.NET...
View ArticleASP.NET Response.Flush could be breaking your site
We just announced our new expert How-To series, where we’ll be bringing you some of the best practices and techniques we’ve been using with customers. The post this week is about the Response.Flush...
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How-To: Remove slow Azure instances
In case you missed it, LeanSentry How-To last week was about removing slow or unhealthy Azure instances from your cloud service. It’s a relatively new technique made possible by a new Azure API, that...
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When CPU profiling goes bad in production
This week’s Leansentry How-To article covers a tricky topic: how to recover from a failed CPU profiler that has frozen your process in production. Recovering from a CPU profiling failure This is...
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The master guide to proactive IIS monitoring
IIS monitoring tools provide a wealth of metrics about your IIS websites, application pools, and requests. But what they don’t provide is a blueprint for how you can use this data to proactively...
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New guide to IIS and asp.net hangs
Website hangs, lockups, requests queueing in ExecuteRequestHandler, slow requests, website not responding. This is the most common, and most frustrating problem that many production IIS websites...
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You may be massively overpaying for your CPUs
Two months ago, we released an expert guide on high CPU in the IIS worker process. This guide went into great detail on how high or even moderate CPU usage in w3wp.exe can spell poor performance for...
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Async await hangs in ASP.NET Core, MVC and WebAPI
Debugging async await hangs is hard! When I first wrote the LeanSentry Hang diagnostics, most .NET web applications were developed using synchronous patterns. Meaning, developers called long-blocking...
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Fixing W3WP.exe memory leaks is easier than you think
Fixing memory leaks is more important (and easier) than you think. I talked about w3wp.exe CPU usage a lot in the last few months, but there is another thing that can have even more impact on your...
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