Troubleshooting
Problem
"The request failed with HTTP status 503: The service is unavailable" when launching Cognos via the IIS gateway
Cause
The application pool (which is running the Cognos-related services) has a problem.
The application pool stops as soon as 
Cognos is launched.
Cognos is launched.Environment
Windows environment
Diagnosing The Problem
Review the Windows event viewer.
The Windows Event Viewer showed the error below:
The Module DLL C:\Windows\system32\inetsrv\re
Resolving The Problem
Search for new Windows Update and apply the updates.
Run the IIS configuration script.
Document Location
Worldwide
[{"Business Unit":{"code":"BU002","label":"Business Analytics"},"Product":{"code":"SSTSF6","label":"Cognos Analytics"},"Component":"","Platform":[{"code":"PF033","label":"Windows"}],"Version":"","Edition":""}]
Document Information
Modified date:
18 June 2019
UID
ibm10885372