The intuitive dashboard of this IIS log analysis software makes data readily available, enabling teams to drill down into logs, identify issues, and take quick actions to troubleshoot errors. Moreover, the tool allows teams to detect anomalies on IIS servers, send alerts in real time, and import logs using its log scheduler.
Additionally, the tool offers the following:. As more and more log solutions enter the marketplace, it becomes increasingly difficult to choose a solution with the ability to aggregate, filter, and analyze logs from IIS web servers. All the solutions highlighted above are robust and advanced log analyzer tools designed to monitor and analyze IIS logs.
In my opinion, SolarWinds Security Event Manager and SolarWinds Loggly are some of the best log analyzer tools, as they both provide unified log analysis and log monitoring features. They also integrate with other tools under the SolarWinds umbrella to offer a seamless logging experience.
Before making a final decision, teams can download a free trial of Loggly to evaluate its performance and understand how it resolves performance issues through unique features such as the live tail feature, exception tracking, and root cause analysis.
They can also download a free trial of Security Event Manager to see how this IIS log analyzer can help them secure web servers and data. Toggle navigation. Loggly IIS log analyzer. All rights reserved. WebLog Expert. Deep Log Analyzer. Sumo Logic. However, it turns out that it is very possible to compute a basic satisfaction score using your existing IIS logs! If you are confused by the SQL query to compute the sat score, just take my word for it At the same time, it's amazing that we can do this at all.
This uses the SLA time of 2 seconds. That definitely needs work. No discussion of IIS logs is complete without noting that the default time-taken field that we are using to determine response times includes the network time - the time to send the response to the client.
As a result, clients on slow or mobile connections may log very long response times, even though your application generated the response quickly. This may tag fast requests as slow and lower your satisfaction score.
Now that I have a general sense of the problem overall sat score is fairly low , I want to localize it: figure out where in the site I am losing requests so I begin to identify the specific issues I can fix. This is useful to see what caused satisfaction drops for each URL. This is now specific enough for me to investigate and address. I will do this by inspecting the errors causing failed requests on this URL. Additionally, I can make a short list of other issues causing the highest satisfaction score impact and repeat this process to address them.
Our satisfaction score queries thus far have clearly identified which URLs have slow and failed requests, and whether slow or failed requests are the bulk of the issue. However, we are about to hit some IIS logging limitations that prevent us from getting root causes of performance problems.
IIS logs were never meant to have the answers to WHY performance issues happen, only whether they do. In fact, more data is almost always needed to determine the root causes of errors and slow requests. This is exactly why we built LeanSentry, to aggregate all the necessary data sources to detect specific issues, AND to analyze the runtime state of the application to diagnose their root causes.
To do this, we monitor IIS logs as a starting point, and then perform Just-In-Time diagnostics using a dozen of other data sources to help us get to the bottom of each issue when it happens. For details see enhance your IIS logs. A simple way to determine this is by looking at the number and percentage of slow requests in the site over time.
Barring a few exceptions, this is just how that cookie usually crumbles. The reason for this is actually simple. This produces a time series that you can plot, filtering to any incidents with 2x the typical slow request percentage from the overall time period. This will rely on trackers that you can add to your code using LeanSentry.
Head over to Enhance your IIS logs section for the step by step. Did you find hangs? Hangs are occasional incidents during which many requests pile up and appear blocked.
A hallmark of hangs is a sharp increase in active requests, and many requests taking more than normal amount of time. Or, if you have LeanSentry, you can get the issue code for any website-level issues directly in your IIS logs. This is courtesy of LeanSentry Hang diagnostics, which continuously monitors your application pools for hangs and auto-determines their causes. Head over to the Enhance your IIS logs guide to add this issue information to each slow request in your logs.
Every IIS website will occasionally experience hangs. LeanSentry Hang diagnostics were developed specifically to do this, and ended up being the most important part of our production diagnostic arsenal. LeanSentry continuously monitors your IIS application pools for signs of hangs, in a way that requires no invasive profilers.
If a hang is detected, LeanSentry occasionally performs a full diagnostic to identify the cause of the hang down to the app code. If you are struggling with hangs, be sure to check out LeanSentry Hang diagnostics. A hallmark of this is a steady, low percent of slow requests in the application URLs that have slow code. These slowdowns can be caused by any number of things, slow SQL queries, large data sets belonging to different users or application entities, slow responses from web services, etc etc.
Alternatively, you can use part 2 of this guide: Enhance your IIS logs to enrich your IIS logs with long running operation tracking, so you can see what makes your requests slow directly in your IIS logs.
IIS logs can help you troubleshoot your site. IIS logs can be configured at the Server or Site level. I personally prefer configuring logging at the Server level as this sets a default logging configuration for all the new sites.
IIS Manager can be used to configure logging. Note that the HTTP Logging feature should be installed refer to the image below for logging to be available. Here is the complete list of fields that are available for logging in to the IIS logging module under log file format W3C.
But one can even change this default location and log to a different directory. Newsletter Subscription.
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