Joie Andrew (7/24/2016)

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When I say the SSRS logs I mean the logs that are natively a part of SSRS. By default they would be located here:

C:\Program Files\Microsoft SQL Server\MSRS13.MSSQLSERVER\Reporting Services\LogFiles

Reporting Services Log Files and Sources

https://msdn.microsoft.com/en-us/library/ms157403.aspx

You should not have to do anything with IIS; SSRS has not used normal IIS since 2008 R2. The Windows Event Logs will not help much here either. Most things with SSRS get written to the SSRS log files.