This means IIS is falling behind in request processing, so all incoming requests are waiting at least this long to begin getting processed. "Http Service Request Queues\MaxQueueItemAge" performance counter increasing.Here are 3 "reasonable" early detection signs: This is not generally a true hang, but rather just a performance problem with a specific part of your application. Only specific URLs in your application are slow.
#SIEMENS STEP 7 STUCK ON CHECK BEFORE LOADING FULL#
This usually occurs before a full hang develops, but may also represent a stable state for an application that is overloaded. Most requests are slow, but eventually load. In rare cases, you may also get a "high CPU hang", which we don't cover here. Also, most of the time, high CPU does not itself cause a hang. NOTE: Most hangs do not involve high CPU, and are often called "low CPU hangs".
Symptoms include detectable request queueing, and sometimes 503 Service Unavailable errors when queue limits are reached. All requests to your application are very slow or time out. Its important to differentiate the following kinds of hangs: It's generally caused by all available application threads becoming blocked, causing subsequent requests to get queued (or sometimes by the number of active requests exceeding configured concurrency limits). You'll need basic knowledge of Microsoft troubleshooting tools, and time.įirst, lets define what website hang really means.Īn IIS website hangs whenever it appears to stop serving incoming requests, with requests either taking a very long time or timing out. In this article, I'll show you how you can systematically isolate and diagnose most hangs in production.
They may be happening only sometimes and can be hard to catch.Hangs are fairly common for production applications, and can be incredibly frustrating to troubleshoot. Catch and diagnose hangs automatically.Īll of a sudden, your website appears to have stopped working.Note: This is the original guide that inspired LeanSentry's own automatic hang diagnostics.
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