Behind a load balancer, requests to load report images intermittently fail with "Provided document Id has expired. Please refresh your browser to generate a new one."

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Last Updated: 07 Apr 2026 09:20 by Scott

Scott

Created on: 07 Apr 2026 09:20

Category: Report Server

Type: Bug Report

Behind a load balancer, requests to load report images intermittently fail with "Provided document Id has expired. Please refresh your browser to generate a new one."

We've recently deployed a new infrastructure with multiple instances running Telerik Report Servers behind a load balancer.

In this new structure, we noticed a new intermittent bug when rendering some reports using the HTML5 report viewer, which is breaking some of our images included in PictureBox controls due to 400 Bad Request errors.

Upon further inspection, it seems the error happens because one of the instances is returning the following error instead of loading the image, hence the intermittency.

Provided document Id has expired. Please refresh your browser to generate a new one.

When I try opening the URL of the image directly on my browser and keep refreshing, it sometimes loads, but other times shows the error above, which seems to indicate it's a problem with one of the instances.

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