WAS event id 5011

Question

WAS event id 5011

hotmail.com bangu00 176

Dear all
My IIS on window 2012 R2 host is keep on crashing due to Event ID 5011.
So, how can I find out which webpage is causing such a problem?

Thanks a lot.

Anonymous

2021-07-08T08:08:47.177+00:00

Hi @hotmail.com bangu00 ,

There is a professional forum specific for IIS cases
https://forums.iis.net/**
Hence I believe that the best answer to this question is to contact IIS.NET Forums
hotmail.com bangu00 176 Reputation points

2021-07-08T14:03:44.907+00:00

Thanks you for your guide.
Lex Li 6,037 Reputation points Microsoft Employee

2025-01-02T01:28:28.03+00:00

(deleted)

Accepted answer

1 additional answer

Your answer

Anonymous

2021-07-08T08:08:47.177+00:00

Hi @hotmail.com bangu00 ,

There is a professional forum specific for IIS cases
https://forums.iis.net/**
Hence I believe that the best answer to this question is to contact IIS.NET Forums
hotmail.com bangu00 176 Reputation points

2021-07-08T14:03:44.907+00:00

Thanks you for your guide.
Lex Li 6,037 Reputation points Microsoft Employee

2025-01-02T01:28:28.03+00:00

(deleted)

Answer 1

Hello there，

This issue may be caused by some services not started.
You could take below methods to resolve this issue:
Method A)
Recycle the application pool "MSExchangeMapiFrontEndAppPool" from IIS Manager.
IIS Manager > Application Pools > MSExchangeMapiFrontEndAppPool > Recycle

Method B )
Reset IIS with this cmd commend line
iisreset /noforce

Method C )
if not working, try rebooting your sever
You may also check if the Microsoft Exchange Transport service and other transport related services are running properly on your server, we could restart them manually.

Official docs for your reference:
Event ID 5011 — IIS Application Pool Availability
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc735271(v=ws.10)
Recycling Settings for an Application Pool <recycling>
https://learn.microsoft.com/en-us/iis/configuration/system.applicationHost/applicationPools/add/recycling/
IIS Application Pool Crash and Debug Diag
https://learn.microsoft.com/en-us/archive/blogs/parvez/iis-application-pool-crash-and-debug-diag

Similar cases:
Exchange 2016 - Event ID 5011 - WAS warning RRS feed
https://social.technet.microsoft.com/Forums/en-US/7727025b-1818-459d-94a4-35c9fa1c0e52/exchange-2016-event-id-5011-was-warning
WAS event 5011
https://forums.iis.net/t/1231656.aspx

However, there is also a professional forum for IIS cases
https://forums.iis.net/
Hence I believe that the best answer to this question is to contact IIS.NET Forums

============================================

If the Answer is helpful, please click "Accept Answer" and upvote it.

Best Regards,
Samson Peng

hotmail.com bangu00 176 Reputation points

2021-07-08T14:08:40.597+00:00

hello Samson Peng

Thank you for your kind explanation.

OK i will try to contack to IIS.Net forums
Stephen Johnston 0 Reputation points

2025-01-01T15:05:25.78+00:00

Thank you for taking the time to create this post.

Answer 2

Lex Li 6,037 Microsoft Employee

Event ID 5011 contains details on the problematic IIS application pool name, crashed process ID, as well as the actual error code in raw bytes. From there you might be able to track down the actual IIS sites/applications that caused the crash.

But usually server administrators should use a tool like Debug Diagnostics Tool to capture crash dumps and learn more about the culprit.

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WAS event id 5011

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