A issue was reports on a Windows 2008R2 IIS server where the hosted site was going down repeatedly, Investigation revealed IIS Application pool keeps crashing with the following event logged in event viewer.
Log Name: System Source: Microsoft-Windows-WAS
Event ID: 5139 Task Category: None
Level: Warning Keywords: Classic User: N/A
Description: A listener channel for protocol ‘http’ in worker process ‘XXXX’ serving application pool ‘Name of AppPool’ reported a listener channel failure. The data field contains the error number.
Upon further troubleshooting we found some corruption in IIS binaries, To validate that we executed SFC /ScanNow and checked the Cbs.log (%windir%\logs\cbs\cbs.log).
The Log revealed the files which sfc /scannow wasn’t able to repair, we un-installed the updates relevant to those files and installed the latest hotfixes of those files.
Rebooted the Server and found IIS working fine.
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