Opening a report via a Report Library in SharePoint results in a 504 Gateway Error

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http://serverfault.com – I've created some reports in BIS and uploaded the .rdl and .rds files to a SharePoint Report Library. Attempting to access the reports leads to a 504 Gateway Time-out The server didn't respond in time. message. I've attempted to replace the data source property on the report with a custom connection string and a stored credential. (HowTos)