Yes No. Thank you! Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. SYS driver? Img 3, HTTP.
But when the application pool is down, the request does not even reach IIS. The response comes from HTTP. SYS, not from the w3wp. Without a w3wp. SYS, while acting as a proxy, basically says:. Look, dear client, I tried to relay your request to IIS, to its w3wp. But the app or its configuration is repeatedly crashing the worker process, so creation of new processes ceased. Hence, I had no process where to relay your request; there is no service ready to process your request.
As with all applications, exceptions happen, unforeseen errors. They all start as first-chance exceptions. Fortunately, these exceptions — first-chance or second-chance — may leave traces. The first place to look at is in the Windows Events, Application log.
As an illustration, the code of my application running in the BuggyBits. Img 6, First-chance exception by app in. NET Runtime. Since the exception could not be handled by the Asp. Net, it immediately became a second-chance exception, causing Windows to terminate the w3wp. Img 7, Second-chance exception crashing w3wp. If you notice the time-stamp in the capture above, it corresponds to a Warning event from WAS in the System log, telling that the worker process did not respond Img 2.
Remember that I said WAS is creating the worker processes, w3wp. It has to know if the worker process is healthy, if it can still serve requests.
Of course, WAS is not able to know everything about the health of a w3wp. But at least it can send pings to that process. Illustrating with the Advanced Settings of an application pool, WAS is sending pings to its instances of w3wp.
For each ping, the w3wp. If no ping response is received, WAS concludes that the process is dead: a crash or hang happened — no process thread is available to respond to the ping. Notice that we also have other time limits too that WAS is looking on. Offer available to new subscribers only. Get unprecedented levels of performance and versatility on a inch screen. Available with Windows Get online meetings, chat, and shared cloud storage - all in one place with the free version of Microsoft Teams.
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