Api call connection resets

Hello,

In an ASP .Net Core 8 API, we have an issue with the processing of a call that lasts longer than 2 minutes.
It lasts long because we have to parse a ton of files (call can be 5-6 minutes), we know this should be improved, but that's beside the point here.

In a previous version of this API (.Net Framework 4.8), this call used to last just as long, and the API did not reset the connection.

In the .Net 8 version, we get such a message :

Connection id "xxx" reset.
Connection id "xxx" sending FIN because: "The Socket transport's send loop completed gracefully."
Connection id "xxx" disconnecting.

After some googling and copilot'ing, we found that this seems related to Kestrel configuration, so we tried several things:

- serverOptions.Limits.KeepAliveTimeout = TimeSpan.FromMinutes(5);
- Changed a few parameters related to timeouts in IIS
- Changed the timeout parameter from the client app calling the API

.. but nothing works.

Does anyone have experience with this ?

It's clear that the timeout duration has to be adjusted somewhere, but we have no idea where to look.

Thanks in advance Image may be NSFW.
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