ERR_HTTP2_PROTOCOL_ERROR when load page.aspx running on IIS 10

Question

I have a .net framework application running on IIS version 10.0.17763.1 hosted on an Azure Virtual Machine and sometimes my users are getting ERR_HTTP2_PROTOCOL_ERROR

This site can’t be reachedThe webpage at https://..../page.aspx might be temporarily down or it may have moved permanently to a new web address. ERR_HTTP2_PROTOCOL_ERROR

I have no idea how to debug and it's an intermittent issue

The only thing that is failing to load is the page.aspx, all the JS and CSS are loading properly.

Answer 1

I encountered the same net::ERR_HTTP2_PROTOCOL_ERROR issue and managed to resolve it by installing the ASP.NET Hosting Bundle and the C++ Redistributable 2015-2022.

Here’s what worked for me:

1. Install the ASP.NET Hosting Bundle: This ensures that all necessary components for running ASP.NET applications are present on your server.
2. Install the C++ Redistributable 2015-2022: This includes essential runtime components required by many applications.

After installing these, the error was resolved, and my website started functioning correctly.