Internet Information Services
Microsoft web server software.
1,736 questions
Why can't I start the application pool on my PC
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梓珺 张
20
Reputation points
After I start the application, I find that it stops automatically and all websites report HTTP 503 service unavailable. This happens for all application pools. How can I solve this problem?
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Lex Li (Microsoft) 6,022 Reputation points Microsoft Employee2025-03-02T20:55:24.0066667+00:00 Duplicate to old posts like https://learn.microsoft.com/en-us/answers/questions/1613772/application-pool-apppool-is-being-automatically-di
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梓珺 张 20 Reputation points
2025-03-03T01:05:11.5433333+00:00 There is no repetition, the fault symptoms are different. My one shuts down immediately after starting, while his one shuts down a few seconds after starting, and I had already turned off the automatic protection function before asking the question
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(150.4, 0%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXP%3C/text%3E%3C/svg%3E)
XuDong Peng-MSFT 11,661 Reputation points Microsoft External Staff2025-03-03T08:25:43.5666667+00:00 Hi @梓珺 张,
It is difficult to locate the problem based on the problem description and screenshots. Have you tried to check the following points:
- Is the application pool identity expired (account/password correct)?
- Create new app pool and publish your website.
- Is the SSL certificate bound correctly (if it is bound)?
- Check the event viewer for error messages.
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梓珺 张 20 Reputation points
2025-03-16T05:54:46.31+00:00 Hello, first of all thanks for the reply, at the moment I don't need to fix this issue anymore! Thank you!
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