Are you seeing something like this while attempting to render a report in SSRS in SharePoint 2013…or perhaps any version of SharePoint with integrated SSRS?
Try this.
Edit the web.config for the SharePoint site in which SSRS is installed. C:\inetpub\wwwroot\wss\VirtualDirectories\Portal-80, for example.
In the web.config, find the <handlers> section within the <system.webServer> section and add the following:
<add name=”ReportViewerWebPart” verb=”*” path=”Reserved.ReportViewerWebPart.axd” type=”Microsoft.ReportingServices.SharePoint.UI.WebParts.WebPartHttpHandler, Microsoft.ReportingServices.SharePoint.UI.WebParts, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91″ />
Reload the page and voila’! You’ll at least get some errors you can deal with.
Now, on to the next problem…
Are you a user? 
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