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I have a 64 bit server. I have changed the application pool to enable the 32 bit DLLs ("enable 32 bit DLL"). After I reset IIS and check it gives this error:

Error : "503 Service Unavailable".

I checked in IIS and found that the application pool is automatically stopped.

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2 Answers 2

Reset to default
5

You typically get 503 Service unavailable when the application pool fails 5 times in less than 5 minutes. It could happen if your credentials for the service account isn't correct.

Try using a different credentials (or use Network Service/Local System) just for testing purpose. If it still doesn't work, take a look at your Event logs and share the results.

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2 Comments

Amazing. I've been trying to figure this out for weeks. I came across this question (stackoverflow.com/questions/19652709/…), but none of the answers helped. Using your answer, I made my app pool fail five times within just a minute and, sure enough, 503 code. Now I can apply a fix to the problem
On IIS 10 only once will make the app pool stopping so 503 will raise.
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In my case Application pool user profile is corrupted, so windows create new temporary profile for that.

If you have C:\Users\TEMP.IIS APPPOOL folder in your machine then Application pool user profile is corrupted.

Below step working for me:

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your link is broken.
I have updated web.archive.org link.

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