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conficient avatar conficient commented on September 17, 2024

The cause of this error was a bug in the .NET 6 runtime version.

We were able to run the ASP.NET NET6 application on our dev machines and talk to the back-end website without issues, which pointed to the IIS10 web server having some difference that was causing the issue. I found this issue on the reverse-proxy repo which sounded exactly like our issue.

Our YARP version used for Cocoon had been upgraded in our branch of Cocoon to use YARP 2.0: this had exposed a bug in .NET 6 runtime prior to v6.0.12 which had this issue.

When we checked the IIS 10 server the .NET runtime used was v6.0.5 so this appeared to be the cause. Our development machines have later SDKs and runtimes installed, which is why it "worked on my machine".

Solution

We upgraded the .NET Runtime on the IIS 10 server to v6.0.16 using the hosting package.

Warning: doing this will make any .NET 6 web applications fail and you will need to restart IIS (using iisreset at the command line is quickest), so you may wish to do this out of business hours.

from cocoon.

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